Ratio and Proportion

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 proportion?

Back

Proportion is an equation that states that two ratios are equal.

Front

If 2 cups of sugar are needed for 3 lemons, how many lemons are needed for 6 cups of sugar?

Back

9 lemons.

Front

How do you find the total hours worked in 30 days if you work 40 hours every 7 days?

Back

You calculate it by finding how many 7-day weeks are in 30 days and multiplying by 40 hours.

Front

What is the formula to find miles per gallon?

Back

Miles per gallon = Total miles traveled / Total gallons used.

Front

What is the ratio of 30 minutes to 2 hours?

Back

1 : 4.

Front

If you travel 150 miles on 5 gallons, how far do you travel per gallon?

Back

30 miles per gallon.

Front

What does it mean if two ratios are in proportion?

Back

It means that the cross products of the ratios are equal.

Front

How do you solve for x in the equation 2x = 12?

Back

Divide both sides by 2, so x = 6.

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity.