Proportions and Percents

Front

What is a proportion?

Back

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

Front

How do you calculate a percent of a number?

Back

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

Front

What is the formula for finding the percent of a total?

Back

The formula is: (Part/Total) x 100 = Percent.

Front

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

Back

$6

Front

What percent of 250 seats are empty if 225 are sold?

Back

10% of the seats are empty.

Front

If 200 children attended a play and 40% were boys, how many girls attended?

Back

120 girls attended the play.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

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 20% of 65?

Back

13

Front

If Pat needs 14 sticks of pepperoni for 28 pizzas, how many sticks are needed for 36 pizzas?

Back

18 sticks of pepperoni are needed.