πagarwalmath · 5th grade · Common Core 6.NS.B.4
🔗 Factors in common
Greatest common factor and least common multiple (and prime factorization)
Name: ______________________Date: ____________
1Which is the prime factorization of 20?
- A2 × 2 × 5
- B2 × 10
- C2 × 2 × 6
- D2 × 2 × 2 × 5
2Which is the prime factorization of 30?
- A2 × 2 × 3 × 5
- B2 × 15
- C2 × 3 × 5
- D2 × 3 × 6
3Which is the prime factorization of 48?
- A2 × 2 × 2 × 2 × 4
- B2 × 2 × 2 × 2 × 3
- C2 × 24
- D2 × 2 × 2 × 2 × 2 × 3
4Which is the prime factorization of 63?
- A3 × 3 × 7
- B3 × 3 × 8
- C3 × 3 × 3 × 7
- D3 × 21
5Which is the prime factorization of 40?
- A2 × 2 × 2 × 2 × 5
- B2 × 2 × 2 × 6
- C2 × 2 × 2 × 5
- D2 × 20
6Which is the prime factorization of 28?
- A2 × 14
- B2 × 2 × 2 × 7
- C2 × 2 × 8
- D2 × 2 × 7
7Which is the prime factorization of 50?
- A2 × 5 × 6
- B2 × 5 × 5
- C2 × 2 × 5 × 5
- D2 × 25
8Which is the prime factorization of 45?
- A3 × 3 × 5
- B3 × 3 × 3 × 5
- C3 × 3 × 6
- D3 × 15
9Which is the prime factorization of 72?
- A2 × 2 × 2 × 3 × 3
- B2 × 2 × 2 × 3 × 4
- C2 × 2 × 2 × 2 × 3 × 3
- D2 × 36
10Which is the prime factorization of 54?
- A2 × 3 × 3 × 3
- B2 × 3 × 3 × 4
- C2 × 2 × 3 × 3 × 3
- D2 × 27
11Which is the prime factorization of 18?
- A2 × 3 × 3
- B2 × 3 × 4
- C2 × 9
- D2 × 2 × 3 × 3
12Which is the prime factorization of 24?
- A2 × 2 × 2 × 4
- B2 × 2 × 2 × 3
- C2 × 12
- D2 × 2 × 2 × 2 × 3
Answer key: Factors in common
- 1. A (2 × 2 × 5)
- 2. C (2 × 3 × 5)
- 3. B (2 × 2 × 2 × 2 × 3)
- 4. A (3 × 3 × 7)
- 5. C (2 × 2 × 2 × 5)
- 6. D (2 × 2 × 7)
- 7. B (2 × 5 × 5)
- 8. A (3 × 3 × 5)
- 9. A (2 × 2 × 2 × 3 × 3)
- 10. A (2 × 3 × 3 × 3)
- 11. A (2 × 3 × 3)
- 12. B (2 × 2 × 2 × 3)
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