This document provides an overview of a 15 Minute Math program that teaches various math skills through short lessons. It consists of 20 lessons covering topics like decimals, fractions, percentages, integers, algebra, and order of operations. Each lesson takes approximately 15 minutes to complete. The document includes examples of problems and step-by-step solutions for lessons on decimal addition, subtraction, multiplication, and division. It encourages finding an extra 15 minutes in one's day to work through the lessons.

1. This presentation will review different math skills that will help you
with every day math problems.
Each lesson takes approximately 15 minutes to do. Almost anyone
can find an extra 15 minutes out of his or her day, whether it be
during breakfast or right before bed. ENJOY!
Look for the teacher. He has special hints to help make
working the math problems faster and easier.
15 Minute Math
DECIMALS

2. 15 Minute Math
 Decimals
o Lesson 1 – What Are Decimals?
o Lesson 2 – Addition & Subtraction
o Lesson 3 – Multiplication
o Lesson 4 – Division
 Fractions
o Lesson 5 – What Are Fractions?
o Lesson 6 - Addition & Subtraction (no
whole #s)
o Lesson 7 – Addition & Subtraction
(with whole #s)
o Lesson 8 – Multiplication & Division
 Percentages
o Lesson 9 – Converting Decimals to
Fractions to Percents
o Lesson 10 – Calculating the Part
o Lesson 11 – Cross-Multiplication
Method
 Integers
o Lesson 12 – Addition & Subtraction
o Lesson 13 – Multiplication, Division, &
Absolute Value
 Algebra
o Lesson 14 – Adding & Subtracting
Variables
o Lesson 15 – Multiplying & Dividing
Variables
o Lesson 16 – Square Roots
 Order of Operations
o Lesson 17 – Please Excuse My Dear
Aunt Sally
o Lesson 18 – Order of Operations with
Variables
 Practice Tests
o Lesson 19 – Practice Test #1
o Lesson 20 – Practice Test #2

3. Try it yourself
2.89 + 1.5 = 20.6 + 10.9 = 3.13 + 9 =
20 + 8.2 = 9.373 + 3.34 = 9 + 2.8 =
12.99 – 8.1 = 19 – 3.2 = 2.933 – 1.2 =
8.4 – 5.555 = 20 – 2.5 = 100 – 2.66 =
2.89 + 1.5 = 4.39 20.6 + 10.9 = 31.5 3.13 + 9 = 12.13
20 + 8.2 = 28.2 9.373 + 3.34 = 12.713 9 + 2.8 = 11.8
12.99 – 8.1 = 4.89 19 – 3.2 = 15.8 2.933 – 1.2 = 1.733
8.4 – 5.555 = 2.845 20 – 2.5 = 17.5 100 – 2.66 = 97.34
End of Lesson 2
15 Minute Math – Decimals
Lesson # 2 – Addition & Subtraction
(REVIEW)
Click for answers:

4. 15 Minute Math – Decimals
Lesson # 3 – Multiplication
This lesson explains how to multiply numbers that
have a decimal point.
Problem: You need to buy 12 pcs. Of chocolate costing ₱5.29 each. How
much will you pay?
5.29
× 12
63.48
When multiplying numbers with decimal points, count the total number of
numbers to the right of the decimal point in the problem and make sure
the answer has the same number!

5.  Don’t worry about the decimal until you’re done multiplying
everything
 First multiply, and then count up the places to the right of the
decimal point and put the decimal in the answer.
3.51 x 1.4  351
×14
1404
+3510
4914
3 decimal
places
 first, multiply 351 by 4
 then, multiply 351 by 10
 then, add up the numbers
 last, since there are a total of 3
decimal places in the problem,
start from the right and move the
decimal 3 places to the left in the
answer (the problem has 3
decimal places and so does the
answer)
 4.914
So, 3.51 x 1.4 = 4.914!
15 Minute Math – Decimals
Lesson # 3 – Multiplication

6.  Remember to only count numbers to the RIGHT of the decimal
point.
2.3 × 0.0002  23
× 2
46
5 decimal
places
 Sometimes you may see
.00046 instead of
0.00046. Both are
right, but it’s more
common to put a 0 in
the ones place.
 0.00046
So, 2.3 x 0.0002 = 0.00046!
15 Minute Math – Decimals
Lesson # 3 – Multiplication
5 decimal
places

7.  There are some shortcuts you can take if you’re multiplying by a
multiple of 10. Multiples of 10 are things like 10, 100, 1000 and
also things like 0.1, 0.01, 0.001, etc.
shift the decimal left 4 places (if you move the decimal point right
(don’t see the decimal point it’s at the end) 2 spaces (100 has 2 0’s)
297 × 0.0001 = 0.0297 2.309 × 100 = 230.9
4 decimal
places
Try not to think about if you’re moving the
decimal to the right or the left. Think if you need
to make the number larger (because you’re
multiplying by a number bigger than 1) or if you
need to make the number smaller (because you’re
multiplying by a number between 0 and 1). Then
move the decimal point in the direction that will
make the number bigger or smaller.
15 Minute Math – Decimals
Lesson # 3 – Multiplication

8. 15 Minute Math – Decimals
Lesson # 3 – Multiplication
Try it yourself
27.2 × 9.2 = 3.2904 × 0.22 = 62.5 × 12.8 =
38 × 0.25 = 0.034 × 0.026 = 8.02 × 2.1 =
2.04 × 0.001 = 589 × 100 = 10.2 × 1.2 =
0.34 × 0.5 = 5.89 × 100 = 9.9999 × 0.01 =
27.2 × 9.2 = 250.24 3.2904 × 0.22 = 0.723888 62.5 × 12.8 = 800
38 × 0.25 = 9.5 0.034 × 0.026 = 0.000884 8.02 × 2.1 = 16.842
2.04 × 0.001 = 0.00204 589 × 100 = 58,900 10.2 × 1.2 = 12.24
0.34 × 0.5 = 0.17 5.89 × 100 = 589 9.9999 × 0.01 = 0.099999
End of Lesson 3
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9. 15 Minute Math – Decimals
Lesson # 4 – Division
This lesson explains how to divide numbers that
have a decimal point.
Problem: A wall measures 96.5 inches tall. You need to install 3.25 inch tall
siding panels. How many panels do you need?
26.5
3.25|96.5
When dividing numbers with decimal points, decimal point placement is key.

10. 15 Minute Math – Decimals
Lesson # 4 – Division
 Remind yourself of the steps you need to take when dividing
1. Divide
2. Multiply
3. Subtract
4. Bring down one
more number
and do it again
8
21|172263
8
21|172263
-168
8
21|172263
-168
4
8
21|172263
-168
42
8203
21|172263
-168
42
-42
06
- 0
63
-63
0

11. Step 1 - Move the decimal of the divisor (outside the house) as far to
the right as you can
Step 2 - Move the decimal of the dividend (inside the house) by the
same number of spaces
Step 3 - Move the decimal straight up onto the answer line
Step 4 - Divide like normal
Problem
8.91 ÷ 3.3
Steps 1 & 2
 3.3 |8.91  33 |89.1
Step 3
.
 33 |89.1
Step 4
2.7
 33 |89.1
- 66
231
- 231
0
 Think of the division sign, | , like a house. With all division
problems, the first number goes inside the house (the 8.91) and the
second goes outside the house (3.3).
 If you forget, think about a problem you know. 10 ÷ 2 = 5. You
wouldn’t say 10 | 2. To work it out you’d say 2 |10 (2 goes into 10.)
15 Minute Math – Decimals
Lesson # 4 – Division

12. Problem
8.91 ÷ 0.0033
Steps 1 & 2
 0.0033 |8.91  33 |89100.
Step 3
.
 33 |89100.
Step 4
2700.
 33 |89100.
- 66
231
- 231
0
Problem
8.91 ÷ 0.33
Steps 1 & 2
 0.33 |8.91  33 |891.
Step 3
.
 33 |891.
Step 4
27.
 33 |891.
- 66
231
- 231
0
Move the decimal 2 places to the right
Move the decimal 2 places to the right
Fill in the empty spaces with zeroes
15 Minute Math – Decimals
Lesson # 4 – Division

13. 15 Minute Math – Decimals
Lesson # 4 – Division
Try it yourself
3.2 ÷ 64 = 60.8 ÷ 19 = 187.53 ÷ 3 =
3.2 ÷ 6.4 = 60.8 ÷ 0.19 = 187.53 ÷ 0.03 =
32 ÷ 6.4 = 0.608 ÷ 0.19 = 18753 ÷ 0.3 =
32 ÷ 0.00064 = 608 ÷ 1.9 = 0.0018753 ÷ 0.3 =
3.2 ÷ 64 = 0.05 60.8 ÷ 19 = 3.2 187.53 ÷ 3 = 62.51
3.2 ÷ 6.4 = 0.5 60.8 ÷ 0.19 = 320 187.53 ÷ 0.03 = 6251
32 ÷ 6.4 = 5 0.608 ÷ 0.19 = 3.2 18753 ÷ 0.3 = 62510
32 ÷ 0.00064 = 50000 608 ÷ 1.9 = 320 0.0018753 ÷ 0.3 = 0.006251
End of Lesson 4
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14. THANK YOU!
I HOPE YOU HAVE LEARNED SOMETHING TODAY!