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4MA1/1F Nov 2021, Question 4: Directed Numbers

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks

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The question, in short

Table gives midnight and midday temperatures in °C for five North American cities on a Monday; answer three questions about lowest midnight value, Boston's change, and Detroit's Thursday midday value.

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

Part (a) · 1 mark

Identify which of the five cities has the lowest midnight temperature from the table.

  1. 1Look at the midnight temperatures: −2, 11, −8, −7, 0
  2. 2The lowest is −8°C
  3. 3This is in Chicago

AnswerChicago

Part (b) · 1 mark

Calculate the difference between Boston's midnight temperature and its midday temperature.

  1. 1Midday temperature in Boston: 14°C
  2. 2Midnight temperature in Boston: −2°C
  3. 3Difference = 14 − (−2) = 14 + 2 = 16°C

Answer16

Part (c) · 2 marks

Starting from Detroit's Monday midday temperature, add 2°C per day for three days to find Thursday's midday temperature.

  1. 1Midday temperature in Detroit on Monday: −1°C
  2. 2Increases by 2°C each day
  3. 3Tuesday: −1 + 2 = 1°C
  4. 4Wednesday: 1 + 2 = 3°C
  5. 5Thursday: 3 + 2 = 5°C

Answer5

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