Ratios and Rates

Front

What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a to b' or a:b.

Front

How can you express a ratio?

Back

A ratio can be expressed in three ways: as a fraction (a/b), with a colon (a:b), or in words (a to b).

Front

If the ratio of cats to dogs is 2:3 and there are 10 cats, how many dogs are there?

Back

15 dogs.

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity, such as miles per hour or price per item.

Front

Which of the following is a unit rate: 60 miles in 2 hours or 30 miles per hour?

Back

30 miles per hour.

Front

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

Back

The ratio of flour to sugar is 2:3.

Front

What is the missing number in the ratio 4:5 if the first number is 16?

Back

20.

Front

If there are 12 apples and 8 oranges, what is the ratio of apples to oranges?

Back

The ratio of apples to oranges is 3:2.

Front

True or False: A ratio can only compare two quantities.

Back

True.

Front

If the ratio of boys to girls in a class is 5:4 and there are 20 boys, how many girls are there?

Back

16 girls.