What you’ll learn
Understand and calculate unit rates.
Key idea
Miles per hour uses total miles divided by total hours.
Total miles divided by their own hours gives miles per hour; multiplying or inverting these units is not equivalent.
Worked example
Classify examples and non-examples for the concept 'Understand and calculate unit rates'.
A car travels 18 miles in 6 hours. Is 4 miles per hour an example of its unit rate? Classify with calculation evidence.
- A unit rate expresses the distance traveled in one hour.
- Divide 18 by 6 to obtain 3 miles per hour; compare with 4.
Answer: Non-example — 18÷6=3 miles per one hour, not matching the claim.
Quick Check
Classify examples and non-examples for the concept 'Understand and calculate unit rates'.
A car travels 45 miles in 9 hours. Is 5 miles per hour an example of its unit rate? Classify with calculation evidence.