Proportions

Front

What is a proportion?

Back

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

Front

If 14 sticks of pepperoni make 28 pizzas, how many sticks are needed for 36 pizzas?

Back

18 sticks

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

Front

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

Back

x = 12

Front

What is the cross product of the ratios 2/3 and 4/6?

Back

The cross product is 2 * 6 = 12 and 3 * 4 = 12, so they are equal.

Front

If 5/8 = x/32, what is x?

Back

x = 20

Front

What does it mean if two ratios are not a proportion?

Back

It means that the cross products of the ratios are not equal.

Front

If 7/10 = 21/x, what is the value of x?

Back

x = 30

Front

What is the first step to solve for x in a proportion?

Back

Cross multiply the two ratios.

Front

If 1/2 = x/10, what is x?

Back

x = 5