Ratio, proportion and rates of changeKey Stage 3

Expressing one amount as a percentage of another

Choose the correct denominator when comparing two amounts.

  • Use .
  • Check that the amounts use the same units.

Example 1

Express as a percentage of .

Divide the first amount by the comparison amount, then multiply by 100.

Example 2

Express as a percentage of .

Divide the first amount by the comparison amount, then multiply by 100.

Your turn

Question 1

Express as a percentage of .

Check answer
Divide the first amount by the comparison amount, then multiply by 100.
Question 2

Express as a percentage of .

Check answer
Divide the first amount by the comparison amount, then multiply by 100.
Question 3

Express as a percentage of .

Check answer
Divide the first amount by the comparison amount, then multiply by 100.
Question 4

Express as a percentage of .

Check answer
Divide the first amount by the comparison amount, then multiply by 100.
Question 5

Express as a percentage of .

Check answer
Divide the first amount by the comparison amount, then multiply by 100.
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