Sample lesson · Arithmetic Reasoning
Find the cost of one
A unit rate compares an amount with one unit. It helps you compare prices even when packages contain different quantities.
Work through an example
Five identical storage boxes cost $17.50 in total. What is the cost per box?
- Identify what you need. Dollars for one box.
- Divide the total cost by the number of boxes.$17.50 ÷ 5 = $3.50 per box
- Check your result.5 × $3.50 = $17.50
Why the order matters
Dollars divided by boxes gives dollars per box. Reversing the order answers a different question. Write the units before calculating.