7th Grade On Level - 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 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 for x in a proportion?

Back

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

Front

If 3/4 = x/16, what is the value of x?

Back

x = 12.

Front

How can you check if two ratios are proportional?

Back

You can check by cross-multiplying and seeing if the products are equal.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.

Front

If Shane can bake 120 dozen cookies in five days, how many days would it take to bake 800 dozen cookies?

Back

It would take 33 days.

Front

If Ms. Hensley can grow 225 bushels in 3 acres, how many bushels can she grow in 9.6 acres?

Back

She can grow 720 bushels.

Front

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

Back

The formula is x = (b*c)/a, where a/b = c/x.