Ratios, Unit Rates, Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

What is a unit rate?

Back

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

Front

How do you calculate a unit rate?

Back

To calculate a unit rate, divide the quantity by the number of units. For example, if you earn $30 for 6 hours of work, the unit rate is $30 ÷ 6 = $5 per hour.

Front

What is a proportion?

Back

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

Front

If 5 candy bars cost $3.00, how much will 2 candy bars cost?

Back

$1.20

Front

What is the better value for cheese: Kraft at $2.29 per oz or Simple at $1.88 per oz?

Back

Simple, because it's $1.88 per oz.

Front

Waldo spent $75 on 5 chicken dinners. What was the unit rate for each dinner?

Back

$15 per dinner.

Front

You earn $15 every 3 weeks. How much will you earn in 5 weeks?

Back

$25.

Front

What is the unit rate if there are 92 miles driven using 4 gallons of gas?

Back

23 miles per gallon.

Front

How do you set up a proportion to solve for an unknown?

Back

Set up a fraction for each ratio and cross-multiply to find the unknown.