What you’ll learn
Understand percent as rate per 100.
Key idea
A numerator can be read as a percent only when the denominator is one hundred.
The whole supplies the denominator; the numerator alone is the percentage only for a whole of one hundred.
Worked example
Classify examples and non-examples for the concept 'Understand percent as rate per 100'.
Is '16 of 400 equal parts means 16%' an example of percent as a rate per 100? Classify and give the equivalent rate per 100.
- Percent compares the selected amount with one hundred equal parts.
- Divide both counts by 4 to get 4 out of 100, meaning 4%.
Answer: Non-example — 16/400=4/100, so the percent is 4%.
Quick Check
Classify examples and non-examples for the concept 'Understand percent as rate per 100'.
Is '11 of 100 equal parts means 11%' an example of percent as a rate per 100? Classify and give the equivalent rate per 100.