Big Ideas Math Chapter 3

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.

Front

How do you find the unit rate from a total amount?

Back

To find the unit rate, divide the total amount by the number of units. For example, if a meal has 310 calories in 5 servings, the unit rate is 310 ÷ 5 = 62 calories per serving.

Front

If you earn $49 for washing 7 cars, how do you find your earnings for washing 1 car?

Back

To find the earnings for washing 1 car, divide the total earnings by the number of cars washed. $49 ÷ 7 = $7 per car.

Front

How do you calculate earnings for a different number of cars?

Back

Multiply the earnings per car by the number of cars washed. If you earn $7 per car, for 4 cars, you earn 4 × $7 = $28.

Front

What is the relationship between feet and yards?

Back

There are 3 feet in 1 yard. To convert feet to yards, divide the number of feet by 3.

Front

How do you convert 39 feet to yards?

Back

To convert 39 feet to yards, divide 39 by 3. 39 ÷ 3 = 13 yards.

Front

What is the formula to find the rate of production?

Back

The formula to find the rate of production is: Rate = Total Output ÷ Total Time. For example, if you make 20 bracelets in 5 hours, the rate is 20 ÷ 5 = 4 bracelets per hour.

Front

How do you compare two rates?

Back

To compare two rates, calculate the unit rate for each and then compare the results. The higher unit rate indicates a better value.

Front

If Soup A has 5 grams of sodium in 12 cups, how do you find the sodium per cup?

Back

To find the sodium per cup, divide the total grams of sodium by the number of cups. 5 grams ÷ 12 cups = approximately 0.42 grams per cup.

Front

If Soup B has 8 grams of sodium in 13 cups, how do you find the sodium per cup?

Back

To find the sodium per cup, divide the total grams of sodium by the number of cups. 8 grams ÷ 13 cups = approximately 0.62 grams per cup.