Division.
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you can compare two measurements using ratios to find the unit rate.
Find the unit prices and compare them to find the cheapest.
Rates are ratios ... Speed is a rate of distance per unit of time... ratio of distance to time. Proportions are two equal ratios, whether they are rates or not.
The following is the answer.
Unit rates are a special type of rates: those where the numerator or, more usually the denominator, of the rate is 1.