Ratios, Rates & Proportions

Front

What is a rate?

Back

A rate is a ratio that compares quantities with different units.

Front

How do you calculate unit rate?

Back

To calculate unit rate, divide the total amount by the number of units. For example, if Alycia earned $20.40 in 3 hours, her unit rate is $20.40 ÷ 3 = $6.80 per hour.

Front

What is a ratio?

Back

A ratio is a relationship between two numbers using division.

Front

What is the relationship between two quantities using division called?

Back

It is called a ratio.

Front

If four pounds of bananas cost $6, what is the cost per pound?

Back

The cost per pound is $1.50.

Front

What is a proportion?

Back

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

Front

How can you express a rate?

Back

A rate can be expressed as a fraction, such as miles per hour or dollars per item.

Front

What is the difference between a ratio and a rate?

Back

A ratio compares two quantities of the same kind, while a rate compares quantities of different kinds.

Front

If a car travels 150 miles in 3 hours, what is its speed in miles per hour?

Back

The speed is 150 miles ÷ 3 hours = 50 miles per hour.

Front

What does it mean if two ratios form a proportion?

Back

It means that the two ratios are equivalent.