Ratios and Unit Rates with Fractions

Question

A box of cereal states that there are 90 calories in a 3/4​-cup serving. What is the unit rate for calories per​ cup? How many calories are there in 4 cups of the​ cereal?

Answer 1

Hello Makeila,

to find the unit rate, you would divide 90 by 3/4. Dividing by a fraction means you would multiply by the upside-down version of the original fraction: 90 ÷ (3/4) = 90 * (4/3) = 360/3 = 120

So the unit rate for calories per cup is 120 calories per cup. That means that there are 120 calories in a cup.

If there's 120 calories in one cup, to find calories in 4 cups, you would simply multiply 120 by 4 to get the answer.

Cheers.