Ratio, proportion and rates of changeKey Stage 3

Using the unitary method

Find one unit, then scale to the required number.

  • Divide to find the value of one unit.
  • Multiply by the number of units needed.
  • Keep the units and currency clear.

Example 1

identical notebooks cost £6. Find the cost of notebooks.

Find the cost of one notebook.

Example 2

identical notebooks cost £12. Find the cost of notebooks.

Find the cost of one notebook.

Remember
Keep the units and currency clear.

Your turn

Question 1

identical notebooks cost £6. Find the cost of notebooks.

Check answer
Find the cost of one notebook.
Question 2

identical notebooks cost £8. Find the cost of notebooks.

Check answer
Find the cost of one notebook.
Question 3

identical notebooks cost £6. Find the cost of notebooks.

Check answer
Find the cost of one notebook.
Question 4

identical notebooks cost £11. Find the cost of notebooks.

Check answer
Find the cost of one notebook.
Question 5

identical notebooks cost £3. Find the cost of notebooks.

Check answer
Find the cost of one notebook.
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