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What is the LCM of 9 and 21?

Practice Questions

Q1
What is the LCM of 9 and 21?
  1. 63
  2. 189
  3. 27
  4. 42

Questions & Step-by-Step Solutions

What is the LCM of 9 and 21?
Correct Answer: 63
  • Step 1: List the multiples of 9. The first few multiples are 9, 18, 27, 36, 45, 54, 63, ...
  • Step 2: List the multiples of 21. The first few multiples are 21, 42, 63, 84, ...
  • Step 3: Look for the smallest number that appears in both lists of multiples. The common multiples are 63, ...
  • Step 4: Identify the smallest common multiple. The smallest common multiple is 63.
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