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0580/12 May/Jun 2021, Question 8: Directed Numbers

Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 2 marks

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The question, in short

Find the number that must be combined with −4 or −9 to reach the stated results.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

Find the number that, added to −4, gives 9.

  1. 19 − (−4) = 13
  2. 2−4 + 13 = 9, so the number is 13

Answer13

Part (b) · 1 mark

Find the number that, subtracted from −9, gives −4.

  1. 1−9 − n = −4
  2. 2n = −9 + 4 = −5

Answer−5

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Also searched as: 0580/12/M/J/21 · 0580_s21_qp_12 · 0580 s21 12 · question 8.
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