Worked examples
Two examples
Example 1
In your head: 15% of 60 is
- 10% of 60 is 6 (move the point one place left).
- 5% is half of that, 3. Together: 6 + 3 = 9.
Answer: 9
Example 2
In your head: 1% of 2,400 is
- 1% is one hundredth: move the point two places left.
Answer: 24
Where this is taught: Ratio, Proportion, and Percent, “Finding 10% and 1% in your head”
The drill
Ten problems
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.