Proportions

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 the two ratios and set the products equal to each other.

Front

What is the ratio of boys to girls if there are 12 boys and 8 girls?

Back

The ratio is 3 to 2.

Front

If a machine can complete a task in a certain time, how do you find the time for multiple tasks?

Back

Multiply the time for one task by the number of tasks.

Front

What is the formula for finding the unit rate?

Back

The unit rate is found by dividing the quantity by the number of units.

Front

If 1 pizza feeds 3 people, how many pizzas are needed for 12 people?

Back

4 pizzas are needed.

Front

What is the relationship between ratios and proportions?

Back

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

Front

How do you find the total cost for a larger group if you know the cost for a smaller group?

Back

Multiply the cost for the smaller group by the ratio of the larger group to the smaller group.

Front

If a car travels 60 miles in 1 hour, how far will it travel in 3 hours?

Back

180 miles.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together.