Civil Service Exam Reviewer · Basic Operations · medium

What is the greatest common factor (GCF) of 15 and 35?

1. 105
2. 5
3. 15
4. 2

Answer

B. 5

Solution

15 = 5 × 3, 35 = 5 × 7, and 3, 7 share no factor, so GCF = 5.

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1. Evaluate: (−17) − (−6) × 3 + 12
2. Evaluate: 5² − 3³ + 5 × 2
3. Divide: 4.76 ÷ 0.14
4. Multiply: 4.4 × 3.59
5. Evaluate: (6/5) × (5/7) ÷ (8/6)
6. Evaluate: 15 + 4 × (12 − 3) ÷ 3
7. Multiply: 77 × 30
8. Evaluate: 55 − (−52)
9. Evaluate: 6² + 35
10. Evaluate: (−9) × 7

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