Ratios and Proportions Unit 9

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

What does it mean if two quantities are directly proportional?

Back

If two quantities are directly proportional, as one quantity increases, the other quantity also increases at a constant rate.

Front

What does it mean if two quantities are indirectly proportional?

Back

If two quantities are indirectly proportional, as one quantity increases, the other quantity decreases.

Front

How do you find a unit rate?

Back

To find a unit rate, divide the quantity by the number of units to express the amount per one unit.

Front

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

Back

The ratio of sugar to flour is 2:3.

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply the known values and then divide to find the unknown value.

Front

What is the unit rate if you spend $60 on 4 gallons of paint?

Back

The unit rate is $15 per gallon.

Front

If a car travels 300 miles in 5 hours, what is its speed in miles per hour?

Back

The speed is 60 miles per hour.

Front

What is the weight limit of a freight elevator if it can carry 10 drums weighing 435 pounds each?

Back

The weight limit is 4350 pounds.