Multiple choice

Find the L.C.M of 4, 7 and 21.

  1. 84

  2. 63

  3. 42

  4. 21
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

4 = 22 7 = 71 21 = 3 x 7 LCM = 22 x 7 x 3 = 84

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