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Prime Numbers and Factors
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Prime Numbers and Factors
📚 Part 1: Identifying Prime Numbers
1. Select all the prime numbers from the list below:
15
17
19
21
2. Which number is a prime?
49
51
53
55
3. True or false: 1 is a prime number.
True
False
4. Match each number with whether it is prime or composite.
A. 2
B. 15
C. 31
D. 49
1. Composite
2. Prime
3. Prime
4. Composite
✏️ Part 2: HCF and LCM (show working)
5. Find the Highest Common Factor (HCF) of 48 and 72. Show your working.
6. Find the HCF of 35 and 50. Write your answer and show a short method.
7. Find the Lowest Common Multiple (LCM) of 6 and 8. Show your working.
8. Find the LCM of 4 and 9. Write your answer.
9. (Challenge) Use prime factorisation to find the HCF of 84 and 98. Explain briefly.
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