Proportions

Front

What is a proportion?

Back

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

Front

How do you set up a proportion?

Back

To set up a proportion, you can use the formula a/b = c/d, where a and b are the first ratio, and c and d are the second ratio.

Front

If 3 apples cost $6, how much do 5 apples cost?

Back

$10

Front

What is the cross-multiplication method in proportions?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio to find if the two ratios are equal.

Front

If a recipe calls for 2 cups of sugar for every 5 cups of flour, how much sugar is needed for 15 cups of flour?

Back

6 cups of sugar.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

Front

If there are 4 red marbles and 6 blue marbles, what is the ratio of red to blue marbles?

Back

2:3.

Front

How do you find a missing value in a proportion?

Back

You can find a missing value by cross-multiplying and solving for the unknown.

Front

If 10 pounds of hamburger meat costs $30, how much does 1 pound cost?

Back

$3 per pound.

Front

What is the relationship between ratios and proportions?

Back

Ratios are used to compare two quantities, while proportions show that two ratios are equal.