1. Today we will compute a given percent as a part of a whole number.
compute – figure out an answer using math
percent – per one hundred (100)
whole number –numbers that start with zero and have no decimals or fractions
Concept

2. When you take a test your score is shown as a percent
When you take a test your score is shown as a percent. For example, lets say you take a math test that has 100 questions on it. If you score 70%, the number of answers correct is 70.
APK

3. Percent
Percent means per hundred. It is another way of saying, “out of one hundred.” CD

4. Whole Numbers
Whole Numbers are numbers that start with zero and do not have decimals or fractions. CD

5. I have read 95% of the books out of my 100-book- collection.CD

6. How to compute a given percent of a whole number.
1. When you see a percent problem you know when you read “of” in the problem you multiply.
2. Change your percent to a decimal and then move it two places to the left.
3. Multiply just like a regular decimal multiplication problem.
Place the decimal point 2 places to the left in your answer.

7. How to Find the Percent of a Whole Number
The first thing to remember is “of” means multiply in mathematics. of x =
Copyright © 2000 by Monica Yuskaitis

8. How to Find the Percent of a Whole Number
Step 1 - When you see a percent problem you know when you read “of” in the problem you multiply. x
25% of 200
Copyright © 2000 by Monica Yuskaitis

9. How to Find the Percent of a Whole Number
Step 2 – Change your percent to a decimal and then move it two places to the left. . .
25% x 200
Copyright © 2000 by Monica Yuskaitis

10. How to Find the Percent of a Whole Number
Step 3 – Multiply just like a regular decimal multiplication problem.
200
x . 25
1000
+400
5000
Copyright © 2000 by Monica Yuskaitis

11. How to Find the Percent of a Whole Number
Step 4 – Place the decimal point 2 places to the left in your answer.
200
x . 25
1000
+400 .
5000
Copyright © 2000 by Monica Yuskaitis

12. What is the percent of this number?.
20 % of 820 . x
820
1. When you see a percent problem you know when you read “of” in the problem you multiply.
2. Change your percent to a decimal and then move it two places to the left.
3. Multiply just like a regular decimal multiplication problem.
Place the decimal point 2 places to the left in your answer.
x . 20
000
+1640 .
16400
Copyright © 2000 by Monica Yuskaitis

13. What is the percent of this number?. x
40 % of 725 . 1 2
725
1. When you see a percent problem you know when you read “of” in the problem you multiply.
2. Change your percent to a decimal and then move it two places to the left.
3. Multiply just like a regular decimal multiplication problem.
Place the decimal point 2 places to the left in your answer.
x . 40
000
+2900 .
29000
Copyright © 2000 by Monica Yuskaitis

14. Multiply the decimal equivalent of the percent with the whole number
Multiply the decimal equivalent of the percent with the whole number. 75% of 4 2
.75 4
1. When you see a percent problem you know when you read “of” in the problem you multiply.
2. Change your percent to a decimal and then move it two places to the left.
3. Multiply just like a regular decimal multiplication problem.
Place the decimal point 2 places to the left in your answer. x
3 0 .

15. .50 12 x 1 0 + 5 . 6 00 6 What is 50% of a dozen(12)? 50% = ½ = .50
50% = ½ = .50
Therefore:
(dozen) 12 X =
.50 6 12 x
1 0 + 5 .
6 00

16. .40 20 x + 8 . 8 00 8 What is 40% of 20? 40% = 40/100 = .40 Therefore:
40% = 40/100 = .40
Therefore:
20 X =
.40 8 20 x + 8 .
8 00

17. What is 3% of 36?
3% = 3/100 = .03
Therefore:
36 X = 1
.03
1.08 36 x 1 8 + 9 .
1 08

18. Why is understanding percent of a whole number important?
You will know the relationship between any whole number and a percent.
You will know how a percent translates into decimals.
What are other reasons why it is important to know how to understand
IMP

19. What is 4% of 56?
4% = 4/100 = .04
Therefore:
56 X =
2.24 2
.04
1. When you see a percent problem you know when you read “of” in the problem you multiply.
2. Change your percent to a decimal and then move it two places to the left.
3. Multiply just like a regular decimal multiplication problem.
Place the decimal point 2 places to the left in your answer. 56 x 2 4 + 2 .
2 24

20. What is 12% of 144?
12% = 12/100 = .12
Therefore:
144 X =
17.28
.12
144
1. When you see a percent problem you know when you read “of” in the problem you multiply.
2. Change your percent to a decimal and then move it two places to the left.
3. Multiply just like a regular decimal multiplication problem.
Place the decimal point 2 places to the left in your answer. x 4 8 4 8 + 1 2 .
17 28

21. 0.10 10% What does percent mean? How do you write as a decimal?
Let’s review what we learned about computing a given percent as a part of a whole number?
“out of a hundred”
What does percent mean?
How do you write
as a decimal?
How do you compute a given percent as a part of a whole number?
10%
0.10
Multiply the whole number
with the decimal equivalent
of the percent.