Proportions

Front

What is a proportion?

Back

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

Front

How do you find a missing value in a proportion?

Back

You can use cross-multiplication to find a missing value in a proportion.

Front

What is the ratio of boys to girls if there are 12 boys and 8 girls?

Back

The ratio of boys to girls is 3 to 2.

Front

If Mary saves $17.50 in 3 weeks, how much will she save in 15 weeks?

Back

Mary will save $87.50 in 15 weeks.

Front

How many weeks will it take to produce 429 wetsuits if 39 are produced every 2 weeks?

Back

It will take 22 weeks to produce 429 wetsuits.

Front

If 13 out of 20 homes have a personal computer, how many homes would you expect to have one on a street with 60 homes?

Back

You would expect 39 homes to have a personal computer.

Front

What is the ratio of sunfish to perch if there are 300 sunfish and the ratio is 4:3?

Back

If there are 300 sunfish, there should be 225 perch.

Front

What is cross-multiplication?

Back

Cross-multiplication is a method used to solve proportions by multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If the ratio of two quantities is 5:3, what does this mean?

Back

This means that for every 5 units of the first quantity, there are 3 units of the second quantity.

Front

How do you convert a ratio to a fraction?

Back

You can convert a ratio to a fraction by writing the first quantity as the numerator and the second quantity as the denominator.