Year 7 Factors, Multiples and Primes Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 7 factors, multiples & primes worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Factors, Multiples & PrimesYear 7 Factors, Multiples and Primes Worksheet — Level 2 — Practice Set 3 — Answers
Part A: Factors
1.List all the factors of 72.
Answer: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
2.List all the factors of 42.
Answer: 1, 2, 3, 6, 7, 14, 21, 42
3.List all the factors of 51.
Answer: 1, 3, 17, 51
4.List all the factors of 36.
Answer: 1, 2, 3, 4, 6, 9, 12, 18, 36
Part B: Multiples
5.Write the first five multiples of 8.
Answer: 8, 16, 24, 32, 40
6.Write the first five multiples of 4.
Answer: 4, 8, 12, 16, 20
7.Write the first five multiples of 7.
Answer: 7, 14, 21, 28, 35
8.Write the first five multiples of 9.
Answer: 9, 18, 27, 36, 45
Part C: HCF and LCM
9.Find the highest common factor (HCF) of 13 and 32.
Answer: 1
- Factors of 13: 1, 13
- Factors of 32: 1, 2, 4, 8, 16, 32
- Highest common factor = 1
10.Find the highest common factor (HCF) of 38 and 39.
Answer: 1
- Factors of 38: 1, 2, 19, 38
- Factors of 39: 1, 3, 13, 39
- Highest common factor = 1
11.Find the lowest common multiple (LCM) of 20 and 40.
Answer: 40
- Multiples of 20: 20, 40, 60, 80…
- Multiples of 40: 40, 80, 120, 160…
- Lowest common multiple = 40
12.Find the highest common factor (HCF) of 18 and 18.
Answer: 18
- Factors of 18: 1, 2, 3, 6, 9, 18
- Factors of 18: 1, 2, 3, 6, 9, 18
- Highest common factor = 18
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