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 percentage?

Back

To calculate a percentage, divide the part by the whole and multiply by 100.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the ratio of y to x in a proportional relationship, represented as k = y/x.

Front

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

Back

120 girls attended the school play.

Front

What is the formula for finding the price per unit?

Back

Price per unit = Total Price / Number of Units.

Front

How do you find the missing side of similar figures?

Back

Use the ratio of corresponding sides to set up a proportion.

Front

What does it mean if two figures are similar?

Back

Two figures are similar if they have the same shape but not necessarily the same size.

Front

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

Back

Sarah spends $6 on Monday.

Front

What is the formula for calculating the percent of a number?

Back

Percent of a number = (Percent / 100) * Number.

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.