Rates/Unit Rates/Better Buy

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It expresses how much of one quantity corresponds to one unit of another quantity.

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How do you calculate a unit rate?

Back

To calculate a unit rate, divide the quantity of one item by the quantity of another item. For example, if a car travels 300 miles in 5 hours, the unit rate is 300 miles ÷ 5 hours = 60 miles per hour.

Front

What is the formula for finding a better buy?

Back

To find a better buy, calculate the unit price for each option and compare them. The option with the lower unit price is the better buy.

Front

If a box of cereal costs $3.60 for 12 ounces, what is the unit price per ounce?

Back

The unit price is $3.60 ÷ 12 ounces = $0.30 per ounce.

Front

What is a ratio?

Back

A ratio is a relationship between two numbers indicating how many times the first number contains the second.

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms of the ratio by their greatest common divisor (GCD). For example, the ratio 8:12 can be simplified to 2:3.

Front

What is the difference between a ratio and a rate?

Back

A ratio compares two quantities, while a rate compares two quantities with different units, such as miles per hour or price per item.

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

How do you find the total cost when given the unit price and quantity?

Back

Multiply the unit price by the quantity. For example, if the unit price is $2 and the quantity is 5, the total cost is $2 × 5 = $10.

Front

What is the unit rate of 408 words in 4 minutes?

Back

The unit rate is 408 words ÷ 4 minutes = 102 words per minute.