1. 2ND GRADE MATHEMATICS

2. NUMBER AND OPERATIONS
 Count by 1s, 5s, and
10s
 Compare numbers
with symbols
 Understanding place
value up to 999
 Add/subtract numbers
with missing values
United States Marine Corps Official Page, “Marines Volunteer with Children” March 14, 2010 via Flickr. Creative Commons Attribution Non Commercial.

3. NUMBER AND OPERATIONS CONT.
 Understand
multiplication with
objects
 Understand division
with multiplication
 Represent commonly
used fractions
 Model fractions with
folding strips
BES Photos, “Student Teacher” March 24, 2008 via Flickr. Creative Commons Attribution Non Commercial Share Alike.

4. COUNTING
 Starting from any number to 1000
 1,2,…8,9,10
 10,20,30,…70,80
20
 100,200,…500,700,800
30
10

5. MATHEMATIC SYMBOLS
 < is less than
 > is greater than
 = is equal to or same
 Alligator trick
 < or > is alligators
mouth eating
78<96 38=38 20>5
67__76
HINT: which one
43__23 would the gator eat?
Pets and wild animals, “Gator” July 31, 2007 via Google Images. Creative Commons Attribution No Derivatives.

6. PLACE VALUES tens
 Ones
number
place is last
62
 Tens place is left of
ones place
ones
 Hundreds place is left
of tens place
hundreds
528 ones
tens

7. PLACE VALUE EXAMPLES
 What number is in the hundreds place?
 587 answer: ___
 823 answer: ___
 What number is in the tens place?
 709 answer: ___
 16 answer: ___
 Write a number with:
 a 6 in the tens place
 9 in the hundreds place
Answer: ___

8. ADDITION
Find missing values Example
 Subtract given
number from the 56+__=93
solution
 Check 93
 Add answer with -56
given number 37 CHECK
 Should be the solution
given 56+37=93

9. SUBTRACTION
Find missing values Example
 Subtract solution from
the given value 43-__=12
 Check
 Subtract new value 43
from given value -12
Should get the given

31
answer
CHECK
43-31=12

10. ADDITION AND SUBTRACTION EXAMPLES
Addition Subtraction
 73+___=90  56-___=12
 Answer: ____  Answer:____
 13+___=57  78-___=20
 Answer: ____  Answer:____
 43+___=59  39-___=9
 Answer: ____  Answer:____

11. MULTIPLICATION
 Example 1. 3 groups of 4
2. Add up each group
3 × 4 =12 3. Get answer
GROUP 1
GROUP 2
GROUP 3
4+4+4=12

12. MULTIPLICATION EXAMPLES
5 × 3=__
8 × 4=__
2 × 9=__

13. DIVISION WITH MULTIPLICATION
 Division is multiplication backwards
1. Take the answer from multiplication problem
2. Divide it by a number in problem
3. Should get other number in problem
EXAMPLE
2 × 4=8 4+4=8
8 ÷ 4=2 4 groups with 2 in each
Total of 8

14. DIVISION EXAMPLES
 9÷3=__
 Make 3 groups
 Put a circle in each until you reach 9
 Answer=3
 3 in each box
 20÷5=__
Answer=4

15. MULTIPLICATION AND DIVISION EXAMPLES
Multiplication Division
 14×2=___  80÷10=___
 15×3=___  45÷9=___
 7×3=___  24÷3=___

16. FRACTIONS
 Filledin strips numerator (top number)
 Total number of strips denominator (bottom
number)
 ½=one half
 ⅓=one third
 ¼=one fourth