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Numbers, units and arithmetic
Numbers, units and arithmetic

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3.17.1 Try some yourself

Activity 57

Evaluate each of the following and give an example from everyday life to illustrate the sum (e.g. Thomas's piggy bank).

  • (a) 4 − 2

  • (b) −3 − 5

Answer

  • (a) 4 − 2 = 4 + 2 = 6. .

  • A gift of £4 plus taking away a £2 debt is equivalent to a gift of £6.

  • (b) 3 − 5 = 3 + 5 = 2.

  • Acquiring a debt of £3 and taking away a debt of £5 results in being £2 better off.