Percents and Word Problems

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 calculate the percent earned on a test?

Back

To calculate the percent earned, subtract the points missed from the total points, then divide by the total points and multiply by 100.

Front

What is 15% of 12?

Back

1.8

Front

How do you find the percent of a group?

Back

To find the percent of a group, divide the part by the whole and multiply by 100.

Front

If 40% of 200 children are boys, how many girls attended?

Back

120 girls attended.

Front

What does it mean to spend a percentage of earnings?

Back

Spending a percentage of earnings means calculating the portion of total earnings that is spent, based on the given percentage.

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 multiply by 100.

Front

What is the formula for calculating percent change?

Back

Percent Change = (New Value - Old Value) / Old Value * 100.

Front

If Sarah earns $20 a day and spends 30% of it, how much does she spend?

Back

She spends $6.

Front

What is the relationship between fractions, decimals, and percents?

Back

Fractions, decimals, and percents are different ways to represent the same value. For example, 1/2 = 0.5 = 50%.