Writing & 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

If a/b = c/d, what is the cross-multiplication method?

Back

The cross-multiplication method states that a * d = b * c.

Front

What is the first step in solving a proportion?

Back

The first step is to set the two ratios equal to each other.

Front

If Jackson buys 36 Pokemon cards for $18, how many cards can he buy for $9?

Back

18 cards.

Front

If Bre spent $4.50 on 3 packs of valentines, how much did each pack cost?

Back

Each pack cost $1.50.

Front

What is the formula to find the unit rate?

Back

The unit rate is found by dividing the total amount by the number of units.

Front

What does it mean to find the missing value in a proportion?

Back

Finding the missing value means determining the unknown quantity that makes the two ratios equal.

Front

If 4/10 = x/25, how do you find x?

Back

Cross-multiply to get 4 * 25 = 10 * x, then solve for x.

Front

What is a unit rate?

Back

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