7th Grade STAAR Review Ratios, Rates, 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

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 form a proportion?

Back

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

Front

What is the ratio of 4 to 7 expressed as a fraction?

Back

4/7

Front

If the ratio of soccer players to baseball players is 4 to 7, how many baseball players are there if there are 12 soccer players?

Back

21 baseball players.

Front

What is a rate?

Back

A rate is a specific kind of ratio that compares two quantities with different units, such as miles per hour.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply and then divide to find the unknown value.

Front

If 88 students are divided into 4 classes, how many students are in each class?

Back

22 students per class.

Front

What is the formula for finding a unit rate?

Back

To find a unit rate, divide the first quantity by the second quantity.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.