SlideShare a Scribd company logo
1 of 29
Download to read offline
Mental Math
 Strategies
  for Grade 3 Students




       All photos Courtesy of
             MS Clip Art




                                Roshel Salvador
What is Mental Math??
It’s the ability to solve math
  equations in your head….
WITHOUT
      using
paper OR a pencil!
With Mental Math
         you can manipulate
           (change) your
         number to make an
          easier equation.
  What’s an equation???
It’s the number sentence.
Here are a few Mental Math
        strategies:

   •   Count on
   •   Doubles
   •   Near Doubles
   •   Make a Friendly Number
   •   Front-End Adding or
       Expanded Notation
Count On:
 If one of the numbers being
 added is a small number,
 then just count on.
Count On:

       7+3=
   3 is a small number,
    so just count on
   to get your answer.
Count On:
  RULE:
   Usually, if one of the numbers
   are from 1 to 5, you can just
   count on.
Doubles:
           Knowing your doubles
           can help you solve
           equations quickly!
Doubles:
  Doubles are when you take a number and
   add it to itself.

  Eg.       2+2=
            9+9=
            15+15=
            25+25=

  You double the number.
Near Doubles:
    Knowing your doubles
     helps with the Near
     Doubles strategy
Near Doubles:
 Near Doubles almost looks like a
  double, but it is off by 1,2,3 or 4
                            Near Double




                             2 + 2+1
    Doubles
                            Doubles
Near Doubles:
Examples of other near doubles:

  11+13=          5+8=
  11 + 11+2=      5 + 5+3
Near Doubles:
  You can even use subtraction for
   near doubles.

  11+13=            5+8=
  13-2 + 13         8-3 + 8

                    8+8 - 3
  13+13 - 2
Make a Friendly Number:

    What is a
   friendly number???
Make a Friendly Number:
   A friendly number is a
    number that ends with a
    “0”.

   Numbers with a “0” in the
    ones spot are easier to
    add with
Make a Friendly Number:
  For example,

   to make 28 a friendly number,
   I can add 2 to it
   to make it 30
Make a Friendly Number:
More examples:

• Add 5 to 35, to make 40
• Subtract 2 from 22 to make 20
Make a Friendly Number:
     This is how it helps:
            9 + 4=

    If I make 9 into a 10,
             10 + 3=
      it is easier to solve
  because I’m working with a
        friendly number.
Make a Friendly Number:
                 BUT….
  Notice how I changed the equation to
           10 + 3, NOT 10 + 4


     I had to manipulate the equation.
Otherwise, I’m just make a new and different
  equation that won’t give the same answer
Make a Friendly Number:
In adding, it is called “give and take”.

If you give to one side, you have to
  take from the other side.

                   9 + 4= 13
           (give 1) +1   -1   (take 1)


                  10 + 3= 13             New equation
Make a Friendly Number:
 In subtracting, it is called
   “give/give” or “take/take”.

 If you give to one side, you have to
   give to the other side.

 If you take from one side, you have
   to take from the other side.
Make a Friendly Number:
Some examples of “give/give” and
 “take/take”:
                      9 – 4= 5
                              (give 1) +1   +1   (give 1)


                                     10 – 5= 5         New equation



        11 – 4= 7
(take 1) -1   -1   (take 1)


       10 – 3= 7         New equation
Make a Friendly Number:

  When you:
  • “give & take” adding
  • “give/give”  subtracting
  • “take/take”  subtracting

  You are compensating!
Front-End Adding
    When you front-end add you
     use expanded notation or
     your place values.
Front-End Adding
Expanded Notation is breaking your
 number into ones, tens and hundreds

Eg. 58                42
    5 tens, 8 ones    4 tens, 2 ones
    50 + 8            40 + 2
Front-End Adding
• Front-end adding is when you start adding
  from the left and move to the right

          Eg.   34 + 45
                - start with the tens: 30 + 40 = 70
                - now the ones: 4 + 5 = 9

  Now you`re working with a friendly number
               70 + 9 = 79
Let’s Review the Mental Math
          Strategies

   •   Count on
   •   Doubles
   •   Near Doubles
   •   Make a Friendly Number
   •   Front-End Adding or
       Expanded Notation

More Related Content

What's hot

Fractions comparing ordering
Fractions comparing  orderingFractions comparing  ordering
Fractions comparing orderingangelwatler
 
One Step Word Problem on Addition
One Step Word Problem on AdditionOne Step Word Problem on Addition
One Step Word Problem on AdditionJohdener14
 
5. lesson 4 subtraction of whole numbers
5. lesson 4 subtraction of whole numbers5. lesson 4 subtraction of whole numbers
5. lesson 4 subtraction of whole numbersJohn Rome Aranas
 
Multiplying 2 to 3 multiplicand by 2-digit multiplier
Multiplying 2 to 3 multiplicand by 2-digit multiplierMultiplying 2 to 3 multiplicand by 2-digit multiplier
Multiplying 2 to 3 multiplicand by 2-digit multiplierhaighdz27
 
Adding Without Regrouping
Adding Without RegroupingAdding Without Regrouping
Adding Without RegroupingJohdener14
 
SUBTRACTION WITH REGROUPING
SUBTRACTION WITH REGROUPINGSUBTRACTION WITH REGROUPING
SUBTRACTION WITH REGROUPINGJohdener14
 
SUBTRACTION WITHOUT REGROUPING
SUBTRACTION WITHOUT REGROUPINGSUBTRACTION WITHOUT REGROUPING
SUBTRACTION WITHOUT REGROUPINGJohdener14
 
Ordering numbers powerpoint
Ordering numbers powerpointOrdering numbers powerpoint
Ordering numbers powerpointJoe Scully
 
Dividing decimals by whole numbers
Dividing decimals by whole numbersDividing decimals by whole numbers
Dividing decimals by whole numbersKristaEvans1024
 
Math primary 3 numbers up to 10 000
Math primary 3 numbers up to 10 000Math primary 3 numbers up to 10 000
Math primary 3 numbers up to 10 000Budhi Nugroho
 
multiplication tables
multiplication tablesmultiplication tables
multiplication tablesGraceMetz
 
Adding without Regrouping
Adding without RegroupingAdding without Regrouping
Adding without RegroupingJohdener14
 
6. lesson 5 multiplication of whole numbers
6. lesson 5 multiplication of whole numbers6. lesson 5 multiplication of whole numbers
6. lesson 5 multiplication of whole numbersJohn Rome Aranas
 
Subtraction with regrouping
Subtraction with regroupingSubtraction with regrouping
Subtraction with regroupingKattStubbs
 
Rounding Numbers (Math 4)
Rounding Numbers (Math 4)Rounding Numbers (Math 4)
Rounding Numbers (Math 4)menchreo
 

What's hot (20)

Fractions comparing ordering
Fractions comparing  orderingFractions comparing  ordering
Fractions comparing ordering
 
One Step Word Problem on Addition
One Step Word Problem on AdditionOne Step Word Problem on Addition
One Step Word Problem on Addition
 
Least common multiple
Least common multipleLeast common multiple
Least common multiple
 
5. lesson 4 subtraction of whole numbers
5. lesson 4 subtraction of whole numbers5. lesson 4 subtraction of whole numbers
5. lesson 4 subtraction of whole numbers
 
Multiplying 2 to 3 multiplicand by 2-digit multiplier
Multiplying 2 to 3 multiplicand by 2-digit multiplierMultiplying 2 to 3 multiplicand by 2-digit multiplier
Multiplying 2 to 3 multiplicand by 2-digit multiplier
 
Adding Without Regrouping
Adding Without RegroupingAdding Without Regrouping
Adding Without Regrouping
 
SUBTRACTION WITH REGROUPING
SUBTRACTION WITH REGROUPINGSUBTRACTION WITH REGROUPING
SUBTRACTION WITH REGROUPING
 
SUBTRACTION WITHOUT REGROUPING
SUBTRACTION WITHOUT REGROUPINGSUBTRACTION WITHOUT REGROUPING
SUBTRACTION WITHOUT REGROUPING
 
Ordering numbers powerpoint
Ordering numbers powerpointOrdering numbers powerpoint
Ordering numbers powerpoint
 
Multiples
 Multiples Multiples
Multiples
 
Dividing decimals by whole numbers
Dividing decimals by whole numbersDividing decimals by whole numbers
Dividing decimals by whole numbers
 
Math primary 3 numbers up to 10 000
Math primary 3 numbers up to 10 000Math primary 3 numbers up to 10 000
Math primary 3 numbers up to 10 000
 
Addition
AdditionAddition
Addition
 
Comparing numbers up to 1000
Comparing numbers up to 1000Comparing numbers up to 1000
Comparing numbers up to 1000
 
Comparing fractions
Comparing fractionsComparing fractions
Comparing fractions
 
multiplication tables
multiplication tablesmultiplication tables
multiplication tables
 
Adding without Regrouping
Adding without RegroupingAdding without Regrouping
Adding without Regrouping
 
6. lesson 5 multiplication of whole numbers
6. lesson 5 multiplication of whole numbers6. lesson 5 multiplication of whole numbers
6. lesson 5 multiplication of whole numbers
 
Subtraction with regrouping
Subtraction with regroupingSubtraction with regrouping
Subtraction with regrouping
 
Rounding Numbers (Math 4)
Rounding Numbers (Math 4)Rounding Numbers (Math 4)
Rounding Numbers (Math 4)
 

Viewers also liked

Edukasyon sa Pagpapakatao
Edukasyon sa PagpapakataoEdukasyon sa Pagpapakatao
Edukasyon sa PagpapakataoKim Haze Rasca
 
EDUKASYON SA PAGPAPAKATAO 2 l7
EDUKASYON SA PAGPAPAKATAO 2 l7EDUKASYON SA PAGPAPAKATAO 2 l7
EDUKASYON SA PAGPAPAKATAO 2 l7Sherill Dueza
 
Ang komunidad (Pamayanan)
Ang komunidad (Pamayanan)Ang komunidad (Pamayanan)
Ang komunidad (Pamayanan)Barangay Suki
 
6-1 Mental Math: Multiplying Decimals by 10, 100, 1000
6-1 Mental Math: Multiplying Decimals by 10, 100, 10006-1 Mental Math: Multiplying Decimals by 10, 100, 1000
6-1 Mental Math: Multiplying Decimals by 10, 100, 1000Rudy Alfonso
 
Multiplication jeopardy game
Multiplication jeopardy gameMultiplication jeopardy game
Multiplication jeopardy gamerryan80
 
Comparing fractions and decimals
Comparing fractions and decimalsComparing fractions and decimals
Comparing fractions and decimalsg2desai
 
Multiplication arrays ppt
Multiplication arrays pptMultiplication arrays ppt
Multiplication arrays pptrryan80
 
Decimals guide
Decimals guideDecimals guide
Decimals guideSmithnz
 
Mathematics
MathematicsMathematics
Mathematicsskku_npc
 
Natural and artificial light
Natural and artificial lightNatural and artificial light
Natural and artificial lightSLIDE TEACHER
 
Grade 5 mtap reviewer
Grade 5 mtap reviewerGrade 5 mtap reviewer
Grade 5 mtap reviewerEclud Sugar
 
4-5 Mental Math: Multiplication Patterns: Using 10, 100, 1000
4-5 Mental Math: Multiplication Patterns: Using 10, 100, 10004-5 Mental Math: Multiplication Patterns: Using 10, 100, 1000
4-5 Mental Math: Multiplication Patterns: Using 10, 100, 1000Rudy Alfonso
 
Strategic intervention material
Strategic intervention materialStrategic intervention material
Strategic intervention materialRodtips
 
Learning multiplication
Learning multiplicationLearning multiplication
Learning multiplicationjadenlover
 
Strategic Intervention Materials
Strategic Intervention MaterialsStrategic Intervention Materials
Strategic Intervention MaterialsBrian Mary
 
Multiplication Powerpoint
Multiplication PowerpointMultiplication Powerpoint
Multiplication PowerpointMandie Funk
 
Grade 3 Arts Teachers Guide
Grade 3 Arts Teachers GuideGrade 3 Arts Teachers Guide
Grade 3 Arts Teachers GuideLance Razon
 
Writer's Notebook Explained
Writer's Notebook ExplainedWriter's Notebook Explained
Writer's Notebook Explainedmslesliegordon
 

Viewers also liked (20)

Edukasyon sa Pagpapakatao
Edukasyon sa PagpapakataoEdukasyon sa Pagpapakatao
Edukasyon sa Pagpapakatao
 
EDUKASYON SA PAGPAPAKATAO 2 l7
EDUKASYON SA PAGPAPAKATAO 2 l7EDUKASYON SA PAGPAPAKATAO 2 l7
EDUKASYON SA PAGPAPAKATAO 2 l7
 
Ang komunidad (Pamayanan)
Ang komunidad (Pamayanan)Ang komunidad (Pamayanan)
Ang komunidad (Pamayanan)
 
6-1 Mental Math: Multiplying Decimals by 10, 100, 1000
6-1 Mental Math: Multiplying Decimals by 10, 100, 10006-1 Mental Math: Multiplying Decimals by 10, 100, 1000
6-1 Mental Math: Multiplying Decimals by 10, 100, 1000
 
Multiplication jeopardy game
Multiplication jeopardy gameMultiplication jeopardy game
Multiplication jeopardy game
 
Comparing fractions and decimals
Comparing fractions and decimalsComparing fractions and decimals
Comparing fractions and decimals
 
Multiplication arrays ppt
Multiplication arrays pptMultiplication arrays ppt
Multiplication arrays ppt
 
Decimals guide
Decimals guideDecimals guide
Decimals guide
 
Mathematics
MathematicsMathematics
Mathematics
 
10 Ridiculous Hacks to 5X Click-Through Rates
10 Ridiculous Hacks to 5X Click-Through Rates 10 Ridiculous Hacks to 5X Click-Through Rates
10 Ridiculous Hacks to 5X Click-Through Rates
 
Natural and artificial light
Natural and artificial lightNatural and artificial light
Natural and artificial light
 
Grade 5 mtap reviewer
Grade 5 mtap reviewerGrade 5 mtap reviewer
Grade 5 mtap reviewer
 
4-5 Mental Math: Multiplication Patterns: Using 10, 100, 1000
4-5 Mental Math: Multiplication Patterns: Using 10, 100, 10004-5 Mental Math: Multiplication Patterns: Using 10, 100, 1000
4-5 Mental Math: Multiplication Patterns: Using 10, 100, 1000
 
source of light
source of lightsource of light
source of light
 
Strategic intervention material
Strategic intervention materialStrategic intervention material
Strategic intervention material
 
Learning multiplication
Learning multiplicationLearning multiplication
Learning multiplication
 
Strategic Intervention Materials
Strategic Intervention MaterialsStrategic Intervention Materials
Strategic Intervention Materials
 
Multiplication Powerpoint
Multiplication PowerpointMultiplication Powerpoint
Multiplication Powerpoint
 
Grade 3 Arts Teachers Guide
Grade 3 Arts Teachers GuideGrade 3 Arts Teachers Guide
Grade 3 Arts Teachers Guide
 
Writer's Notebook Explained
Writer's Notebook ExplainedWriter's Notebook Explained
Writer's Notebook Explained
 

Similar to Mental Math Strategies for Grade 3

Mental Math Works
Mental Math WorksMental Math Works
Mental Math WorksLS13527
 
Powerpoint
PowerpointPowerpoint
Powerpointsteph348
 
Powerpoint
PowerpointPowerpoint
Powerpointsteph348
 
An introduction to addition final version
An introduction to addition final versionAn introduction to addition final version
An introduction to addition final versionlaskowski07
 
Tricky math shortcut
Tricky math shortcutTricky math shortcut
Tricky math shortcutAbhi world
 
Edt 365 something to teach
Edt 365  something to teachEdt 365  something to teach
Edt 365 something to teachHDH128
 
Add / Sub
Add / SubAdd / Sub
Add / Subr0bb13
 
Math orientation, place value, estimation, rounding, basic ops word problems
Math orientation, place value, estimation, rounding, basic ops word problemsMath orientation, place value, estimation, rounding, basic ops word problems
Math orientation, place value, estimation, rounding, basic ops word problemsmathn3rd
 
Math journal chapters 1 3
Math journal chapters 1 3Math journal chapters 1 3
Math journal chapters 1 3Ernie777
 
playing with numbers class 8
playing with numbers class 8 playing with numbers class 8
playing with numbers class 8 HimakshiKava
 
10 ways to do fast math
10 ways to do fast math10 ways to do fast math
10 ways to do fast mathnazeer08cs79
 
Negative numbers adding and subtracting
Negative numbers adding and subtractingNegative numbers adding and subtracting
Negative numbers adding and subtractingTerry Golden
 
Amazing Math Trick
Amazing Math TrickAmazing Math Trick
Amazing Math TrickN8 G
 

Similar to Mental Math Strategies for Grade 3 (20)

Mental Math Works
Mental Math WorksMental Math Works
Mental Math Works
 
Mental math
Mental mathMental math
Mental math
 
decimals. .pptx
decimals.                          .pptxdecimals.                          .pptx
decimals. .pptx
 
Math tricks
Math tricksMath tricks
Math tricks
 
Powerpoint
PowerpointPowerpoint
Powerpoint
 
Powerpoint
PowerpointPowerpoint
Powerpoint
 
Decimal
DecimalDecimal
Decimal
 
An introduction to addition final version
An introduction to addition final versionAn introduction to addition final version
An introduction to addition final version
 
Tricky math shortcut
Tricky math shortcutTricky math shortcut
Tricky math shortcut
 
Decimals
DecimalsDecimals
Decimals
 
Edt 365 something to teach
Edt 365  something to teachEdt 365  something to teach
Edt 365 something to teach
 
Add / Sub
Add / SubAdd / Sub
Add / Sub
 
30 Simple Algebra Tricks for Students
30 Simple Algebra Tricks for Students30 Simple Algebra Tricks for Students
30 Simple Algebra Tricks for Students
 
Math orientation, place value, estimation, rounding, basic ops word problems
Math orientation, place value, estimation, rounding, basic ops word problemsMath orientation, place value, estimation, rounding, basic ops word problems
Math orientation, place value, estimation, rounding, basic ops word problems
 
Math journal chapters 1 3
Math journal chapters 1 3Math journal chapters 1 3
Math journal chapters 1 3
 
playing with numbers class 8
playing with numbers class 8 playing with numbers class 8
playing with numbers class 8
 
Amazing Maths Trick
Amazing Maths TrickAmazing Maths Trick
Amazing Maths Trick
 
10 ways to do fast math
10 ways to do fast math10 ways to do fast math
10 ways to do fast math
 
Negative numbers adding and subtracting
Negative numbers adding and subtractingNegative numbers adding and subtracting
Negative numbers adding and subtracting
 
Amazing Math Trick
Amazing Math TrickAmazing Math Trick
Amazing Math Trick
 

Recently uploaded

How to Manage Buy 3 Get 1 Free in Odoo 17
How to Manage Buy 3 Get 1 Free in Odoo 17How to Manage Buy 3 Get 1 Free in Odoo 17
How to Manage Buy 3 Get 1 Free in Odoo 17Celine George
 
6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroom6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroomSamsung Business USA
 
Indexing Structures in Database Management system.pdf
Indexing Structures in Database Management system.pdfIndexing Structures in Database Management system.pdf
Indexing Structures in Database Management system.pdfChristalin Nelson
 
ESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnv
ESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnvESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnv
ESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnvRicaMaeCastro1
 
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...Nguyen Thanh Tu Collection
 
4.11.24 Poverty and Inequality in America.pptx
4.11.24 Poverty and Inequality in America.pptx4.11.24 Poverty and Inequality in America.pptx
4.11.24 Poverty and Inequality in America.pptxmary850239
 
BIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptx
BIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptxBIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptx
BIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptxSayali Powar
 
ICS 2208 Lecture Slide Notes for Topic 6
ICS 2208 Lecture Slide Notes for Topic 6ICS 2208 Lecture Slide Notes for Topic 6
ICS 2208 Lecture Slide Notes for Topic 6Vanessa Camilleri
 
An Overview of the Calendar App in Odoo 17 ERP
An Overview of the Calendar App in Odoo 17 ERPAn Overview of the Calendar App in Odoo 17 ERP
An Overview of the Calendar App in Odoo 17 ERPCeline George
 
Mythology Quiz-4th April 2024, Quiz Club NITW
Mythology Quiz-4th April 2024, Quiz Club NITWMythology Quiz-4th April 2024, Quiz Club NITW
Mythology Quiz-4th April 2024, Quiz Club NITWQuiz Club NITW
 
ClimART Action | eTwinning Project
ClimART Action    |    eTwinning ProjectClimART Action    |    eTwinning Project
ClimART Action | eTwinning Projectjordimapav
 
CLASSIFICATION OF ANTI - CANCER DRUGS.pptx
CLASSIFICATION OF ANTI - CANCER DRUGS.pptxCLASSIFICATION OF ANTI - CANCER DRUGS.pptx
CLASSIFICATION OF ANTI - CANCER DRUGS.pptxAnupam32727
 
Q-Factor HISPOL Quiz-6th April 2024, Quiz Club NITW
Q-Factor HISPOL Quiz-6th April 2024, Quiz Club NITWQ-Factor HISPOL Quiz-6th April 2024, Quiz Club NITW
Q-Factor HISPOL Quiz-6th April 2024, Quiz Club NITWQuiz Club NITW
 
MS4 level being good citizen -imperative- (1) (1).pdf
MS4 level   being good citizen -imperative- (1) (1).pdfMS4 level   being good citizen -imperative- (1) (1).pdf
MS4 level being good citizen -imperative- (1) (1).pdfMr Bounab Samir
 
Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17Celine George
 
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...Nguyen Thanh Tu Collection
 
Sulphonamides, mechanisms and their uses
Sulphonamides, mechanisms and their usesSulphonamides, mechanisms and their uses
Sulphonamides, mechanisms and their usesVijayaLaxmi84
 
How to Uninstall a Module in Odoo 17 Using Command Line
How to Uninstall a Module in Odoo 17 Using Command LineHow to Uninstall a Module in Odoo 17 Using Command Line
How to Uninstall a Module in Odoo 17 Using Command LineCeline George
 
Employablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptxEmployablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptxryandux83rd
 

Recently uploaded (20)

How to Manage Buy 3 Get 1 Free in Odoo 17
How to Manage Buy 3 Get 1 Free in Odoo 17How to Manage Buy 3 Get 1 Free in Odoo 17
How to Manage Buy 3 Get 1 Free in Odoo 17
 
6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroom6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroom
 
Indexing Structures in Database Management system.pdf
Indexing Structures in Database Management system.pdfIndexing Structures in Database Management system.pdf
Indexing Structures in Database Management system.pdf
 
ESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnv
ESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnvESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnv
ESP 4-EDITED.pdfmmcncncncmcmmnmnmncnmncmnnjvnnv
 
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
 
4.11.24 Poverty and Inequality in America.pptx
4.11.24 Poverty and Inequality in America.pptx4.11.24 Poverty and Inequality in America.pptx
4.11.24 Poverty and Inequality in America.pptx
 
BIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptx
BIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptxBIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptx
BIOCHEMISTRY-CARBOHYDRATE METABOLISM CHAPTER 2.pptx
 
ICS 2208 Lecture Slide Notes for Topic 6
ICS 2208 Lecture Slide Notes for Topic 6ICS 2208 Lecture Slide Notes for Topic 6
ICS 2208 Lecture Slide Notes for Topic 6
 
An Overview of the Calendar App in Odoo 17 ERP
An Overview of the Calendar App in Odoo 17 ERPAn Overview of the Calendar App in Odoo 17 ERP
An Overview of the Calendar App in Odoo 17 ERP
 
Mythology Quiz-4th April 2024, Quiz Club NITW
Mythology Quiz-4th April 2024, Quiz Club NITWMythology Quiz-4th April 2024, Quiz Club NITW
Mythology Quiz-4th April 2024, Quiz Club NITW
 
ClimART Action | eTwinning Project
ClimART Action    |    eTwinning ProjectClimART Action    |    eTwinning Project
ClimART Action | eTwinning Project
 
CLASSIFICATION OF ANTI - CANCER DRUGS.pptx
CLASSIFICATION OF ANTI - CANCER DRUGS.pptxCLASSIFICATION OF ANTI - CANCER DRUGS.pptx
CLASSIFICATION OF ANTI - CANCER DRUGS.pptx
 
Plagiarism,forms,understand about plagiarism,avoid plagiarism,key significanc...
Plagiarism,forms,understand about plagiarism,avoid plagiarism,key significanc...Plagiarism,forms,understand about plagiarism,avoid plagiarism,key significanc...
Plagiarism,forms,understand about plagiarism,avoid plagiarism,key significanc...
 
Q-Factor HISPOL Quiz-6th April 2024, Quiz Club NITW
Q-Factor HISPOL Quiz-6th April 2024, Quiz Club NITWQ-Factor HISPOL Quiz-6th April 2024, Quiz Club NITW
Q-Factor HISPOL Quiz-6th April 2024, Quiz Club NITW
 
MS4 level being good citizen -imperative- (1) (1).pdf
MS4 level   being good citizen -imperative- (1) (1).pdfMS4 level   being good citizen -imperative- (1) (1).pdf
MS4 level being good citizen -imperative- (1) (1).pdf
 
Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17
 
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (GLOB...
 
Sulphonamides, mechanisms and their uses
Sulphonamides, mechanisms and their usesSulphonamides, mechanisms and their uses
Sulphonamides, mechanisms and their uses
 
How to Uninstall a Module in Odoo 17 Using Command Line
How to Uninstall a Module in Odoo 17 Using Command LineHow to Uninstall a Module in Odoo 17 Using Command Line
How to Uninstall a Module in Odoo 17 Using Command Line
 
Employablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptxEmployablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptx
 

Mental Math Strategies for Grade 3

  • 1. Mental Math Strategies for Grade 3 Students All photos Courtesy of MS Clip Art Roshel Salvador
  • 2. What is Mental Math??
  • 3. It’s the ability to solve math equations in your head….
  • 4. WITHOUT using paper OR a pencil!
  • 5. With Mental Math you can manipulate (change) your number to make an easier equation. What’s an equation??? It’s the number sentence.
  • 6. Here are a few Mental Math strategies: • Count on • Doubles • Near Doubles • Make a Friendly Number • Front-End Adding or Expanded Notation
  • 7. Count On: If one of the numbers being added is a small number, then just count on.
  • 8. Count On: 7+3= 3 is a small number, so just count on to get your answer.
  • 9. Count On: RULE: Usually, if one of the numbers are from 1 to 5, you can just count on.
  • 10. Doubles: Knowing your doubles can help you solve equations quickly!
  • 11. Doubles: Doubles are when you take a number and add it to itself. Eg. 2+2= 9+9= 15+15= 25+25= You double the number.
  • 12. Near Doubles: Knowing your doubles helps with the Near Doubles strategy
  • 13. Near Doubles: Near Doubles almost looks like a double, but it is off by 1,2,3 or 4 Near Double 2 + 2+1 Doubles Doubles
  • 14. Near Doubles: Examples of other near doubles: 11+13= 5+8= 11 + 11+2= 5 + 5+3
  • 15. Near Doubles: You can even use subtraction for near doubles. 11+13= 5+8= 13-2 + 13 8-3 + 8 8+8 - 3 13+13 - 2
  • 16. Make a Friendly Number: What is a friendly number???
  • 17. Make a Friendly Number: A friendly number is a number that ends with a “0”. Numbers with a “0” in the ones spot are easier to add with
  • 18. Make a Friendly Number: For example, to make 28 a friendly number, I can add 2 to it to make it 30
  • 19. Make a Friendly Number: More examples: • Add 5 to 35, to make 40 • Subtract 2 from 22 to make 20
  • 20. Make a Friendly Number: This is how it helps: 9 + 4= If I make 9 into a 10, 10 + 3= it is easier to solve because I’m working with a friendly number.
  • 21. Make a Friendly Number: BUT…. Notice how I changed the equation to 10 + 3, NOT 10 + 4 I had to manipulate the equation. Otherwise, I’m just make a new and different equation that won’t give the same answer
  • 22. Make a Friendly Number: In adding, it is called “give and take”. If you give to one side, you have to take from the other side. 9 + 4= 13 (give 1) +1 -1 (take 1) 10 + 3= 13 New equation
  • 23. Make a Friendly Number: In subtracting, it is called “give/give” or “take/take”. If you give to one side, you have to give to the other side. If you take from one side, you have to take from the other side.
  • 24. Make a Friendly Number: Some examples of “give/give” and “take/take”: 9 – 4= 5 (give 1) +1 +1 (give 1) 10 – 5= 5 New equation 11 – 4= 7 (take 1) -1 -1 (take 1) 10 – 3= 7 New equation
  • 25. Make a Friendly Number: When you: • “give & take” adding • “give/give”  subtracting • “take/take”  subtracting You are compensating!
  • 26. Front-End Adding When you front-end add you use expanded notation or your place values.
  • 27. Front-End Adding Expanded Notation is breaking your number into ones, tens and hundreds Eg. 58 42 5 tens, 8 ones 4 tens, 2 ones 50 + 8 40 + 2
  • 28. Front-End Adding • Front-end adding is when you start adding from the left and move to the right Eg. 34 + 45 - start with the tens: 30 + 40 = 70 - now the ones: 4 + 5 = 9 Now you`re working with a friendly number 70 + 9 = 79
  • 29. Let’s Review the Mental Math Strategies • Count on • Doubles • Near Doubles • Make a Friendly Number • Front-End Adding or Expanded Notation