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 terms and then solve for the variable.

Front

If 12 ounces of shampoo lasts 16 weeks, how long will 18 ounces last?

Back

24 weeks.

Front

What is the formula for finding the unit rate?

Back

Unit Rate = Total Amount / Number of Units.

Front

If a hamburger costs $6 for 3 pounds, what is the cost per pound?

Back

$2 per pound.

Front

How do you set up a proportion to find an unknown?

Back

Set up the equation as a/b = c/d, where a, b, c, and d are known values.

Front

What is the relationship between ratios and proportions?

Back

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

Front

If a shop produces 39 wetsuits every 2 weeks, how many weeks to produce 429 wetsuits?

Back

22 weeks.

Front

What does it mean to cross-multiply in a proportion?

Back

Cross-multiplying means multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If x/4 = 2, what is x?

Back

x = 8.