Free practice on HCF and Prime Numbers for Class 5, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
What is the HCF of 12 and 18?
Write your answer, then check below.
Answer:
Factors of 12: 1,2,3,4,6,12. Factors of 18: 1,2,3,6,9,18. Highest common = 6.
What is the HCF of 20 and 30?
Write your answer, then check below.
Answer:
Which number is prime?
Answer: B. 17
17 can only be divided by 1 and 17.
Which of these is NOT a prime number?
Answer: C. 21
21 = 3 × 7, so it is not prime.
Write the smallest odd prime number.
Write your answer, then check below.
Answer:
2 is prime but even; 3 is the smallest odd prime.
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