IXL | Percents of numbers and money amounts | 7th grade math

or

What is

90%

of $10?

$

ref_doc_title.

or

Learn with an example

question

Fill in the missing number.

90% of 40 =

key idea

A percent is 1 part out of 100.

1%
is
equal
to
1
100
or
0.01.

Proportions can be used to solve percent problems.

part

whole

=

percent

100

solution

The whole is 40.

The percent is 90%.

Let n represent the part.

Write a proportion to solve for n.

n

40

=

90

100

100n

=

90 · 40

100n

=

3,600

100n ÷ 100

=

3,600 ÷ 100

n

=

36

90% of 40 = 36

You could also find the answer by writing and solving an equation:

part	=	percentage of whole

n	=	90% · 40

n	=	0.9 · 40

n	=	36

90% of 40 = 36

Looking for more? Try these:

Lesson: Percents

or

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Work it out

Not feeling ready yet? These can help:

CC.7Multiply a decimal by a multi-digit whole number

L.12Solve proportions

O.2Convert between percents, fractions, and decimals

Lesson: Percents