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 63?
- A3 × 21
- B3 × 3 × 8
- C3 × 3 × 3 × 7
- D3 × 3 × 7
2Which is the prime factorization of 30?
- A2 × 2 × 3 × 5
- B2 × 15
- C2 × 3 × 6
- D2 × 3 × 5
3Which is the prime factorization of 20?
- A2 × 10
- B2 × 2 × 5
- C2 × 2 × 6
- D2 × 2 × 2 × 5
4Which is the prime factorization of 42?
- A2 × 2 × 3 × 7
- B2 × 3 × 7
- C2 × 21
- D2 × 3 × 8
5Which is the prime factorization of 12?
- A2 × 2 × 4
- B2 × 2 × 2 × 3
- C2 × 2 × 3
- D2 × 6
6Which is the prime factorization of 36?
- A2 × 2 × 2 × 3 × 3
- B2 × 18
- C2 × 2 × 3 × 3
- D2 × 2 × 3 × 4
7Which is the prime factorization of 45?
- A3 × 3 × 5
- B3 × 15
- C3 × 3 × 6
- D3 × 3 × 3 × 5
8Which is the prime factorization of 40?
- A2 × 2 × 2 × 2 × 5
- B2 × 20
- C2 × 2 × 2 × 5
- D2 × 2 × 2 × 6
9Which is the prime factorization of 24?
- A2 × 12
- B2 × 2 × 2 × 4
- C2 × 2 × 2 × 3
- D2 × 2 × 2 × 2 × 3
10Which is the prime factorization of 72?
- A2 × 2 × 2 × 2 × 3 × 3
- B2 × 2 × 2 × 3 × 3
- C2 × 2 × 2 × 3 × 4
- D2 × 36
11Which is the prime factorization of 54?
- A2 × 3 × 3 × 4
- B2 × 27
- C2 × 2 × 3 × 3 × 3
- D2 × 3 × 3 × 3
12Which is the prime factorization of 50?
- A2 × 5 × 5
- B2 × 5 × 6
- C2 × 25
- D2 × 2 × 5 × 5
Answer key: Factors in common
- 1. D (3 × 3 × 7)
- 2. D (2 × 3 × 5)
- 3. B (2 × 2 × 5)
- 4. B (2 × 3 × 7)
- 5. C (2 × 2 × 3)
- 6. C (2 × 2 × 3 × 3)
- 7. A (3 × 3 × 5)
- 8. C (2 × 2 × 2 × 5)
- 9. C (2 × 2 × 2 × 3)
- 10. B (2 × 2 × 2 × 3 × 3)
- 11. D (2 × 3 × 3 × 3)
- 12. A (2 × 5 × 5)
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