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 41.
Answer: 1, 41
2.List all the factors of 12.
Answer: 1, 2, 3, 4, 6, 12
3.List all the factors of 49.
Answer: 1, 7, 49
4.List all the factors of 20.
Answer: 1, 2, 4, 5, 10, 20
Part B: Multiples
5.Write the first five multiples of 4.
Answer: 4, 8, 12, 16, 20
6.Write the first five multiples of 6.
Answer: 6, 12, 18, 24, 30
7.Write the first five multiples of 3.
Answer: 3, 6, 9, 12, 15
8.Write the first five multiples of 8.
Answer: 8, 16, 24, 32, 40
Part C: HCF and LCM
9.Find the lowest common multiple (LCM) of 12 and 20.
Answer: 60
- Multiples of 12: 12, 24, 36, 48…
- Multiples of 20: 20, 40, 60, 80…
- Lowest common multiple = 60
10.Find the lowest common multiple (LCM) of 34 and 40.
Answer: 680
- Multiples of 34: 34, 68, 102, 136…
- Multiples of 40: 40, 80, 120, 160…
- Lowest common multiple = 680
11.Find the lowest common multiple (LCM) of 39 and 26.
Answer: 78
- Multiples of 39: 39, 78, 117, 156…
- Multiples of 26: 26, 52, 78, 104…
- Lowest common multiple = 78
12.Find the highest common factor (HCF) of 31 and 37.
Answer: 1
- Factors of 31: 1, 31
- Factors of 37: 1, 37
- Highest common factor = 1
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.