Ratios and proportions

Front

What is a Ratio?

Back

A ratio is a comparison of two quantities.

Front

Write the ratio of 5 apples to 3 apples.

Back

5:3

Front

If there are 8 red marbles and 4 blue marbles, what is the ratio of blue marbles to red marbles?

Back

4:8 or 1:2

Front

What is the ratio of 10 to 5?

Back

10:5 or 2:1

Front

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

Back

2:3

Front

How do you simplify the ratio 12:16?

Back

Divide both sides by 4 to get 3:4.

Front

If there are 15 boys and 10 girls in a class, what is the ratio of girls to boys?

Back

10:15 or 2:3

Front

What is a proportion?

Back

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

Front

If 4 pencils cost $2, how much do 12 pencils cost?

Back

$6 (using the ratio 4:2 to find the cost for 12 pencils).

Front

What is the ratio of 5 oranges to 10 fruits in total?

Back

5:10 or 1:2.