ratios and proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, expressing how much of one quantity exists in relation to another.

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios are proportional?

Back

Two ratios are proportional if the cross products are equal.

Front

What is a unit rate?

Back

A unit rate is a comparison of a quantity to one unit of another quantity, often expressed as 'per' something.

Front

How do you simplify a ratio?

Back

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

Front

What is the ratio of boys to girls in a class with 16 boys and 32 girls?

Back

The ratio of boys to girls is 1 to 2, or 1:2.

Front

If you spend $40 on 5 pounds of concrete, what is the cost per pound?

Back

The cost per pound is $8.

Front

What does it mean for a relationship to be proportional?

Back

A relationship is proportional if it maintains a constant ratio or unit rate.

Front

How can you express a ratio as a fraction?

Back

A ratio can be expressed as a fraction by placing the first quantity over the second quantity.

Front

What is the simplest form of the ratio 16:32?

Back

The simplest form of the ratio 16:32 is 1:2.