Year 7 Factors, Multiples and Primes Worksheet — Level 3 — Practice Set 2 — 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 3 — Practice Set 2 — Answers
Part A: Factors
1.List all the factors of 50.
Answer: 1, 2, 5, 10, 25, 50
2.List all the factors of 22.
Answer: 1, 2, 11, 22
3.List all the factors of 20.
Answer: 1, 2, 4, 5, 10, 20
4.List all the factors of 21.
Answer: 1, 3, 7, 21
Part B: Multiples
5.Write the first five multiples of 11.
Answer: 11, 22, 33, 44, 55
6.Write the first five multiples of 10.
Answer: 10, 20, 30, 40, 50
7.Write the first five multiples of 5.
Answer: 5, 10, 15, 20, 25
8.Write the first five multiples of 6.
Answer: 6, 12, 18, 24, 30
Part C: HCF and LCM
9.Find the lowest common multiple (LCM) of 11 and 17.
Answer: 187
- Multiples of 11: 11, 22, 33, 44…
- Multiples of 17: 17, 34, 51, 68…
- Lowest common multiple = 187
10.Find the highest common factor (HCF) of 19 and 18.
Answer: 1
- Factors of 19: 1, 19
- Factors of 18: 1, 2, 3, 6, 9, 18
- Highest common factor = 1
11.Find the lowest common multiple (LCM) of 25 and 34.
Answer: 850
- Multiples of 25: 25, 50, 75, 100…
- Multiples of 34: 34, 68, 102, 136…
- Lowest common multiple = 850
12.Find the lowest common multiple (LCM) of 22 and 15.
Answer: 330
- Multiples of 22: 22, 44, 66, 88…
- Multiples of 15: 15, 30, 45, 60…
- Lowest common multiple = 330
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