Solving Proportions

Front

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

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.

Front

If 8 slices of pizza cost $12, what is the cost per slice?

Back

$1.50

Front

If 3 pounds of hamburger costs $6, what is the cost per pound?

Back

$2 per pound.

Front

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

Back

Multiply the unit price by the quantity.

Front

If 1 cm on a map represents 25 km, how many kilometers does 7 cm represent?

Back

175 km.

Front

What is the formula for finding the expected value in a proportion?

Back

Expected value = (part/whole) * total.

Front

If 13 out of 20 homes have a computer, how many computers would you expect in 60 homes?

Back

39 computers.

Front

What does cross-multiplication involve?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.