Ratios and Proportions

Front

What is a Ratio?

Back

A comparison of two quantities.

Front

If you can buy 4 stickers for $2.50, how much would it cost to buy 16 stickers?

Back

$10.

Front

What is a Proportion?

Back

An equation that states two ratios are equal.

Front

Write the ratio of girls to boys if there are 5 boys and 7 girls.

Back

7 to 5.

Front

What is the Proportional Constant?

Back

The constant value that relates two proportional quantities.

Front

If a recipe requires 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

2 to 3.

Front

How do you find a missing value in a proportion?

Back

Cross-multiply and solve for the unknown.

Front

What does it mean if two quantities are in proportion?

Back

It means their ratios are equal.

Front

If 3 apples cost $1.50, how much do 12 apples cost?

Back

$6.00.

Front

What is the formula for finding a ratio?

Back

Ratio = Quantity A : Quantity B.