N4 use the concepts and vocabulary of prime numbers, factors (divisors), multiples,... Quiz: Pearson Edexcel Maths, Unit 1

The 20 questions

1. Which of these numbers is prime?

   • 21
   • 33
   • 27
   • 29

2. What is the highest common factor of 12 and 18?

   • 36
   • 3
   • 2
   • 6

3. What is the lowest common multiple of 4 and 6?

   • 2
   • 24
   • 12
   • 10

4. Which is the prime factorisation of 60?

   • 2 × 3 × 10
   • 2 × 2 × 15
   • 2 × 5 × 6
   • 2² × 3 × 5

5. How many factors does 10 have?

   • 5
   • 4
   • 3
   • 2

6. Which number is a common multiple of 3 and 5 and is less than 20?

   • 18
   • 10
   • 12
   • 15

7. Express 84 as a product of primes in index form.

   • 2³ × 10.5
   • 2² × 21
   • 2 × 3 × 14
   • 2² × 3 × 7

8. What is the highest common factor of 36 and 84?

   • 4
   • 3
   • 12
   • 6

9. What is the lowest common multiple of 8 and 12?

   • 48
   • 96
   • 24
   • 4

10. Which number is NOT a factor of 36?

    • 8
    • 6
    • 12
    • 9

11. Two bells ring every 15 and 20 seconds. After how many seconds do they ring together?

    • 60
    • 300
    • 35
    • 5

12. Which number is a multiple of both 4 and 9?

    • 36
    • 18
    • 24
    • 27

13. Write 180 as a product of prime factors in index form.

    • 2² × 3² × 5
    • 2 × 3² × 10
    • 2² × 3 × 15
    • 2 × 3 × 5 × 6

14. The HCF of two numbers is 6 and their LCM is 72. One number is 18. What is the other?

    • 24
    • 36
    • 48
    • 12

15. How many prime numbers are between 20 and 30?

    • 4
    • 1
    • 2
    • 3

16. Which classification applies to the number 1?

    • even number
    • prime number
    • composite number
    • neither prime nor composite

17. Two numbers have prime factorisations 2³ × 5 and 2 × 3 × 5². What is their HCF?

    • 30
    • 150
    • 10
    • 2

18. What is the smallest positive number that is a multiple of 2, 3, 5 and 7?

    • 420
    • 210
    • 105
    • 42

19. How many positive factors does 36 have?

    • 9
    • 6
    • 8
    • 12

20. What is the smallest positive number divisible by both 4 and 6?

    • 2
    • 8
    • 12
    • 6

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