Lesson eLearning

Which of the following numbers is NOT a factor of 30? a) 6 b) 10 c) 15 d) 20

hard MCQ 3 marks Class 5 · Mathematics · Be My Multiple I Will Be Your Factor
  1. 6
  2. 10
  3. 15
  4. 20
Answer
20

The correct answer is 20 — Thus 20 is not a factor.

Step-by-step solution

  1. Check if 30 ÷ 6 = 5 (integer).
  2. Check 30 ÷ 10 = 3 (integer).
  3. Check 30 ÷ 15 = 2 (integer).
  4. Check 30 ÷ 20 = 1.5 (not integer).
  5. Thus 20 is not a factor.
Common mistake: Thinking 20 divides 30

Concept tested: Identify non‑factor

Published · How this solution was prepared and checked

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