Try some yourself
Activity 61
Evaluate each of the following and where possible give an example from everyday life to illustrate the calculation.
(a) 4 × −3
(b) −2 × −7
(c) −3 × 5
Answer
(a) 4 × −3 = −12.
Four debts of £3 is a debt of £12.
(b) −2 × −7 = 14.
Thomas’s mother taking away two £7 IOUs is equivalent to giving him £14.
(c) −3 × 5 = −15.
Thomas gives away 3 five pound notes, which is equivalent to giving away £15.
OpenLearn - Numbers, units and arithmetic
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