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

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

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

Percent

CD

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

Whole Numbers

CD

Books! I have read 95% of the

books out of my 100-book-

collection.

95 books

CD

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.

Copyright © 2000 by Monica Yuskaitis

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

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.

25% of 200x

Copyright © 2000 by Monica Yuskaitis

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

How to Find the Percent of a Whole Number

• Step 3 – Multiply just like a regular decimal multiplication problem.

200x .251000+4005000

Copyright © 2000 by Monica Yuskaitis

How to Find the Percent of a Whole Number

• Step 4 – Place the decimal point 2 places to the left in your answer.

200x .251000+4005000.

Copyright © 2000 by Monica Yuskaitis

What is the percent of this number?

820x .20000

+164016400

.

20 % of 820.. x1. 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.

Copyright © 2000 by Monica Yuskaitis

What is the percent of this number?

725x .40000

+290029000.

40 % of 725.. x21

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.

Multiply the decimal equivalent of the percent with the whole number.

75% of 4

.754x 0

2

3 0.

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.

What is 50% of a dozen(12)?

50% = ½ = .50Therefore:

(dozen) 12 X .50 = .5012x

01 0

.005+

6 00

6

What is 40% of 20?

40% = 40/100 = .40Therefore:

20 X .40 = .4020x

0 0

.008+

8 00

8

What is 3% of 36?

3% = 3/100 = .03Therefore:

36 X 0.03 = .0336x

8 1

.090+

1 08

1.08

1

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

What is 4% of 56?

4% = 4/100 = .04Therefore:

56 X 0.04 = .0456x

4 2

.002+

2 24

2.24 2

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.

What is 12% of 144?

12% = 12/100 = .12Therefore:

144 X .12 = .12144x

84

.

084+

17 28

17.28

0021

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.

Let’s review what we learned about computing a given percent as a part of a whole number?

• What does percent mean?

• How do you writeas a decimal?

• How do you compute a given percent as a part of a whole number?

“out of a hundred”

10% 0.10

Multiply the whole number with the decimal equivalent of the percent.