Year 7 Factors, Multiples and Primes Worksheet — Level 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 2 — Answers
Part A: Factors
1.List all the factors of 77.
Answer: 1, 7, 11, 77
2.List all the factors of 18.
Answer: 1, 2, 3, 6, 9, 18
3.List all the factors of 23.
Answer: 1, 23
4.List all the factors of 20.
Answer: 1, 2, 4, 5, 10, 20
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 8.
Answer: 8, 16, 24, 32, 40
8.Write the first five multiples of 12.
Answer: 12, 24, 36, 48, 60
Part C: HCF and LCM
9.Find the highest common factor (HCF) of 33 and 15.
Answer: 3
- Factors of 33: 1, 3, 11, 33
- Factors of 15: 1, 3, 5, 15
- Highest common factor = 3
10.Find the lowest common multiple (LCM) of 25 and 24.
Answer: 600
- Multiples of 25: 25, 50, 75, 100…
- Multiples of 24: 24, 48, 72, 96…
- Lowest common multiple = 600
11.Find the highest common factor (HCF) of 18 and 15.
Answer: 3
- Factors of 18: 1, 2, 3, 6, 9, 18
- Factors of 15: 1, 3, 5, 15
- Highest common factor = 3
12.Find the highest common factor (HCF) of 21 and 13.
Answer: 1
- Factors of 21: 1, 3, 7, 21
- Factors of 13: 1, 13
- Highest common factor = 1
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