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What is the greatest common divisor (GCD) of 12 and 15?

Practice Questions

Q1
What is the greatest common divisor (GCD) of 12 and 15?
  1. 1
  2. 3
  3. 4
  4. 6

Questions & Step-by-Step Solutions

What is the greatest common divisor (GCD) of 12 and 15?
Correct Answer: 3
  • Step 1: List the factors of 12. The factors are 1, 2, 3, 4, 6, and 12.
  • Step 2: List the factors of 15. The factors are 1, 3, 5, and 15.
  • Step 3: Identify the common factors from both lists. The common factors are 1 and 3.
  • Step 4: Find the largest common factor. The largest common factor is 3.
  • Step 5: Therefore, the greatest common divisor (GCD) of 12 and 15 is 3.
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