IXL | Solve percent problems

What is 80% of 90?

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Learn with an example

question

45 is what percent of 50?

Write your answer using a percent sign (%).

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 part is 45.

The whole is 50.

Let n represent the percent.

Write a proportion to solve for n.

100

45 · 100

50n

4,500

50n

4,500 ÷ 50

50n ÷ 50

45 is 90% of 50.

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

part

percentage of whole

100

50n

100

0.5

45 is 90% of 50.

Looking for more? Try these:

Lesson: Percents

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Questions
answeredQuestions

Time
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SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

Teacher tools

Work it out

Not feeling ready yet? These can help:

V.4Percents of numbers and money amounts

V.7Find what percent one number is of another

V.9Find the total given a part and a percent

Lesson: Percents

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