Unit rates
Match units, find an amount per unit, and compare situations.
Meaning
A unit rate gives one quantity per unit of a reference quantity. Read both units in unit prices, speeds, and densities.
Example
Juice costing 9,000 won for 3 L costs 3,000 won/L. A 2 L product costing 7,000 won costs 3,500 won/L, so it is more expensive per liter. Assuming each product's price is spread evenly over its volume, divide its 3 L price by 3 to find the price of 1 L. Compare the cost of the same volume, not the two total prices. Won/L and L/won are different, reciprocal quantities. Match units and reference quantities before comparing.
Practice for this concept
Scope and references
Topics
Comparing amounts in different units, including unit prices, speed, and density
Learning goal
Match units, find an amount per unit, and compare situations.
Helpful background
Explore measurement units and division.
Unit-rate practice
These choice exercises cover part of the concept. They do not establish independent solution, understanding of the whole concept, or mastery.