IXL | Percents of numbers: word problems

Tristan's Cafe has regular coffee and decaffeinated coffee. This morning, the cafe served 10 coffees in all, 90% of which were regular. How many regular coffees did the cafe serve?

regular coffees

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Learn with an example

question

In hopes of encouraging healthier snacks at school, Estelle brought in a tray of carrot sticks and apple slices to share. The tray had a total of 80 snacks, of which 90% were carrot sticks. How many carrot sticks did Estelle bring?

carrot sticks

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

Find 90% of 80.

The whole is 80.

The percent is 90%.

Let n represent the part.

Write a proportion to solve for n.

100

100n

90 · 80

100n

7,200

100n ÷ 100

7,200 ÷ 100

Estelle brought 72 carrot sticks.

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

part	=	percentage of whole

n	=	90% · 80

n	=	0.9 · 80

n	=	72

Estelle brought 72 carrot sticks.

Looking for more? Try these:

Lesson: Percents

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Teacher tools

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Not feeling ready yet? These can help:

V.4Percents of numbers and money amounts

V.3Solve percent problems using strip models

V.2Solve percent problems using grid models

Lesson: Percents

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