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 variable.

Front

If 3/4 = x/16, what is x?

Back

x = 12.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If I have 5 apples and 3 oranges, what is the ratio of apples to oranges?

Back

The ratio of apples to oranges is 5:3.

Front

If 2/5 = x/20, what is x?

Back

x = 8.

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 I need 2 cups of sugar for 4 cookies, how much sugar do I need for 12 cookies?

Back

You need 6 cups of sugar.

Front

What does it mean to scale a ratio?

Back

Scaling a ratio means to multiply both terms of the ratio by the same number.

Front

If 1/3 = x/9, what is x?

Back

x = 3.