Reading & writing · Grades 9–12
Reading numerical claims critically · revision card
A percentage needs a base group and a clear time period.
Keep these ideas clear
Check denominators
A percentage needs a base group and a clear time period.
Compare like with like
Definitions, scales, sampling methods and uncertainty affect a comparison.
Two useful examples
A rate rises from 2% to 3%. The increase in percentage points is
1 percentage point
1 percentage point
A rate rises from 2% to 3%. The relative percentage increase is
50%
50%
Explain it without looking
- A poll receives 18 yes responses out of 30 total. What percentage said yes?
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.