Proportions

Front

What is a proportion?

Back

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

Front

How do you set up a proportion?

Back

To set up a proportion, you can use the formula a/b = c/d, where a and b are the first ratio, and c and d are the second ratio.

Front

If 5 ice cream cones are sold for every 3 brownies, what is the ratio of ice cream cones to brownies?

Back

The ratio of ice cream cones to brownies is 5:3.

Front

If there are 24 brownies sold, how many ice cream cones are sold if the ratio is 5:3?

Back

To find the number of ice cream cones, set up the proportion: 5/3 = x/24. Solving gives x = 40.

Front

What is the cross-multiplication method in proportions?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio to find a missing value.

Front

If Pat needs 14 sticks of pepperoni for 28 pizzas, how many sticks are needed for 1 pizza?

Back

To find the number of sticks for 1 pizza, divide 14 by 28, which equals 0.5 sticks per pizza.

Front

How many sticks of pepperoni are needed for 36 pizzas if 0.5 sticks are needed for 1 pizza?

Back

Multiply 0.5 by 36 to get 18 sticks.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity of one per one unit of the other.

Front

If hamburger meat sells for $6 for every 3 pounds, what is the cost per pound?

Back

The cost per pound is $6/3 = $2 per pound.

Front

How much will Alicia pay for 10 pounds of hamburger meat if it costs $2 per pound?

Back

Alicia will pay 10 pounds x $2/pound = $20.