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Daniel is thinking of a number that is divisible by both 12 and 7. What is the smallest possible number that Daniel could be thinking of?

Question

Daniel is thinking of a number that is divisible by both 12 and 7. What is the smallest possible number that Daniel could be thinking of?

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Solution

The smallest number that Daniel could be thinking of is the least common multiple (LCM) of 12 and 7.

Here are the steps to find the LCM:

  1. Prime factorize the numbers:

    • The prime factors of 12 are 2, 2, and 3.
    • The prime factors of 7 are 7.
  2. Write down each prime factor the greatest number of times it occurs in either number:

    • The prime factor 2 occurs twice in 12 and not at all in 7, so write it down twice.
    • The prime factor 3 occurs once in 12 and not at all in 7, so write it down once.
    • The prime factor 7 occurs once in 7 and not at all in 12, so write it down once.
  3. Multiply these prime factors together to get the LCM:

    • 2 * 2 * 3 * 7 = 84.

So, the smallest possible number that Daniel could be thinking of is 84.

This problem has been solved

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