Multiple choice

Alex can make groups of 3, 4 and 9 pencils with no left over. What is smallest number of pencils Alex needs to make these groups?

  1. 28

  2. 30

  3. 34

  4. 36
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

3, 4, 9 Multiples of 3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 Multiples of 4 = 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 Multiples of 9 = 9, 18, 27, 36, 45 LCM of 3, 4, 9 = 36

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