Proportions

Front

What is a proportion?

Back

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

Tags

CCSS.7.RP.A.2A

Front

How do you determine if two ratios are proportional?

Back

Two ratios are proportional if their cross products are equal.

Tags

CCSS.7.RP.A.2A

Front

What is the cross product of the ratios a/b and c/d?

Back

The cross product is ad and bc; if ad = bc, then the ratios are proportional.

Front

If the ratio 5/6 is given, what is a proportional ratio?

Back

25/30 is proportional to 5/6.

Tags

CCSS.7.RP.A.2A

Front

How can you write a proportion using a table of values?

Back

You can write a proportion by setting up a ratio from the table values, such as a/b = c/d.

Front

In a recipe, if 1.5 cups of milk is to 3 cups of flour, how much milk is needed for 5 cups of flour?

Back

2.5 cups of milk is needed to keep the proportions correct.

Tags

CCSS.7.RP.A.2A

Front

What does it mean to cross multiply?

Back

Cross multiplying involves multiplying the numerator of one ratio by the denominator of the other ratio.

Tags

CCSS.3.NF.A.3D

Front

If you have the proportion 2/3 = x/12, how do you solve for x?

Back

Cross multiply to get 2 * 12 = 3 * x, which simplifies to x = 8.

Tags

CCSS.7.RP.A.2C

Front

What is the first step in solving a proportion?

Back

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

Tags

CCSS.7.RP.A.3

Front

What is an example of a non-proportional ratio?

Back

The ratio 6/5 is not proportional to 5/6.

Tags

CCSS.6.RP.A.3A