Percents & Proportions

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and then multiply by 100.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Tags

CCSS.7.RP.A.2A

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply and then divide to find the unknown value.

Tags

CCSS.7.RP.A.2C

Front

What is the formula for simple interest?

Back

The formula for simple interest is I = PRT, where I is interest, P is principal, R is rate, and T is time.

Tags

CCSS.7.RP.A.3

Front

If I = 45, r = 6%, t = 0.5, what is P?

Back

P = 1500.

Tags

CCSS.7.RP.A.3

Front

How do you find what percent one number is of another?

Back

To find what percent one number is of another, divide the first number by the second number and multiply by 100.

Front

What percent of 50 is 80?

Back

160%.

Front

How do you write an equation to represent a percent problem?

Back

You can write an equation in the form of part = percent × whole.

Front

What is the ratio of 1/4 as a percent?

Back

25%.