Ratios and Proportions

Front

What is a Ratio?

Back

A comparison of two quantities.

Front

What is the ratio of red apples to green apples if there are 4 red apples and 3 green apples?

Back

4 red apples to 3 green apples.

Front

Is the proportion 4/5 equal to 20/25?

Back

Yes, they are equal.

Front

Solve for n: 7/n = 14/10

Back

n = 5.

Front

Write the ratio in simplest form: 10 automobiles to 13 bikes.

Back

10/13.

Front

What is a Proportion?

Back

An equation that states two ratios are equal.

Front

How do you simplify a ratio?

Back

Divide both quantities by their greatest common divisor.

Front

If the ratio of boys to girls in a class is 2:3, how many boys are there if there are 15 girls?

Back

10 boys.

Front

What is the cross-multiplication method used for?

Back

To determine if two ratios form a proportion.

Front

If a recipe calls for a ratio of 2 cups of flour to 3 cups of sugar, how much flour is needed for 9 cups of sugar?

Back

6 cups of flour.