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 4/8 = x/16, what is x?

Back

x = 8.

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 I have 3 apples for every 2 oranges, what is the ratio of apples to oranges?

Back

The ratio of apples to oranges is 3:2.

Front

Gracie brought 24 cookies for 3 classes. How many cookies per class?

Back

8 cookies per class.

Front

If I need 5 cups of flour for 3 pies, how many cups do I need for 1 pie?

Back

You need approximately 1.67 cups of flour for 1 pie.

Front

What is the relationship between the number of classes and cookies Gracie should bring for 4 classes?

Back

If she needs 8 cookies per class, she should bring 32 cookies for 4 classes.