solve percent problems you need two different colored highlighters not all slides used in notes

Solve Percent Problems

You need two different colored highlighters

Not all slides used in notes

Percent ProblemscentPer

Means to form a ratio written in a fraction format

Means 100

So 15 percent (15%) means 15/100

A percent is the ratio of a number to 100.

6100 = 6%

Write the percent modeled by the grids below

= 25%25

100= 63%

63

100

Sloths may seem lazy, but their extremely slow movement helps to make them almost invisible to predators. Sloths sleep an average of 16.5 hours a day. To find out what percent of a 24-hour day 16.5 hours is, you can use a proportion or an equation.

Proportion Method Equation Methodn

100= 16.5

24PartWhole

PartWhole

What percent of 24 is 16.5?

n · 24 = 100 · 16.5

24n = 1,650

n = 68.75

n · 24 = 16.5

n = 0.6875

n = 68.75%

Sloths spend about 69% of the day sleeping!

EX 1)

Set up a proportion.

Multiply.

Divide each side by 25 to isolatethe variable.

%100

=PartWhole

%100

= IsOf

15 is 25% of what number?

25100

= 15n

25n = 1,500

25n25

= 1,500 25

n = 60 15 is 25% of 60.

0 10% 50% 100%

0 6015

25%

30

What percent of 50 is 10?

n100

= 1050

n · 50 = 100 · 10

50n = 1,000

50n50

= 1,000 50

n = 20

10 is 20% of 50.

Write a proportion.

Set the cross products equal.

Multiply.

Divide each side by 50 to isolatethe variable.

EX 2)

0 10% 50% 100%

0 50255

20%

10

What is 40% of 20?

40100

= 8n

n · 40 = 100 · 8

40n = 800

40n40

= 800 40

n = 20

8 is 40% of 20.

Write a proportion.

Set the cross products equal.

Multiply.

Divide each side by 40 to isolatethe variable.

EX 3)

0 10% 50% 100%

0 10

40%

202 8

Notes start here

Solve Percent Problems

You need two different colored highlighters

Not all slides used in notes

Date _____________

EX 1) 15 is 25% of what number?

0 10% 50% 100%

0

25%

What percent of 50 is 10?EX 2)

0 10% 50% 100%

0

What is 40% of 20?EX 3)

0 10% 50% 100%

0