Ratio / Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, expressed as 'a to b' or a:b.

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 terms and then solve for the unknown variable.

Front

If 3/4 = x/16, what is x?

Back

x = 12.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per one unit.

Front

If a car travels 300 miles in 5 hours, what is the unit rate of speed?

Back

The unit rate is 60 miles per hour.

Front

How do you find the cost per item?

Back

To find the cost per item, divide the total cost by the number of items.

Front

If 8 slices of pizza cost $12, what is the cost per slice?

Back

The cost per slice is $1.50.

Front

What is the formula for finding a missing value in a proportion?

Back

The formula is a/b = c/d, where you can find the missing value by cross-multiplying.

Front

If 5 pounds of apples cost $10, how much do 10 pounds cost?

Back

10 pounds cost $20.