Ratios and Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common factor (GCF).

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 and then divide to find the unknown value.

Front

What is the ratio of red LEGOS to yellow LEGOS if there are 3 red and 6 yellow?

Back

The ratio is 1:2.

Front

If a class has 30 students and 18 are boys, how many girls are there?

Back

There are 12 girls.

Front

What is the ratio of boys to girls in a class of 30 students with 18 boys?

Back

The ratio is 3:2.

Front

How do you determine which is the better deal between two products?

Back

Calculate the price per unit (e.g., per ounce) for each product and compare.

Front

If Doritos cost $4.39 for 11.5 oz, what is the price per ounce?

Back

The price per ounce is approximately $0.38.

Front

If Cheetos cost $2.24 for 9.75 oz, what is the price per ounce?

Back

The price per ounce is approximately $0.23.