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4MA1/1FR Jun 2022, Question 6: Prime Numbers

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

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The question, in short

From the list 5, 16, 23, 27, 50, 160, 240, identify a cube number and a factor of 80, then find the total of the two primes in the list.

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

Part (ai) · 1 mark

Pick a cube number from the given list of seven numbers.

  1. 1Check which number in the list is a cube: 3³ = 27
  2. 227 is in the list

Answer27

Part (aii) · 1 mark

Pick a number from the list that divides 80 exactly.

  1. 1Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
  2. 2Both 5 and 16 are in the list, so either is correct: 5 or 16

Answer5 or 16

Part (b) · 2 marks

Identify the two prime numbers in the list and calculate their sum.

  1. 1Check each number in the list for primality
  2. 25 is prime
  3. 323 is prime
  4. 4Other numbers are not prime
  5. 55 + 23 = 28

Answer28

Stuck on a step? Read the free lesson: Prime Numbers

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