C6 Topic 6 Review - Understand and Use Percents

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide the percent by 100. For example, 25% becomes 0.25 (25 ÷ 100).

Front

What is 100% of a number?

Back

100% of a number is the number itself. For example, 100% of 50 is 50.

Front

How do you find a percent of a number?

Back

To find a percent of a number, multiply the number by the percent (as a decimal). For example, to find 20% of 50, calculate 50 × 0.20 = 10.

Front

What is the formula to calculate percent change?

Back

Percent change = (New Value - Old Value) / Old Value × 100.

Front

If 8 out of 50 states do not have interstates, what percent is that?

Back

To find the percent, divide 8 by 50 and multiply by 100. (8 ÷ 50) × 100 = 16%.

Front

What is 113% of 62?

Back

To find 113% of 62, multiply 62 by 1.13. 62 × 1.13 = 70.06.

Front

How do you express 0.85% as a decimal?

Back

To express 0.85% as a decimal, divide by 100. 0.85% = 0.0085.

Front

If Mia completed 60% of her homework in 45 minutes, how long will it take her to finish 100%?

Back

If 60% takes 45 minutes, then 100% will take (45 ÷ 60) × 100 = 75 minutes.

Front

What percent of a group is made up of girls if there are 17 girls and 13 boys?

Back

Total members = 17 + 13 = 30. Percent of girls = (17 ÷ 30) × 100 = 56.67%, rounded to 57%.