Lesson eLearning

Express 140 as a product of its prime factors.

medium MCQ Class 7 · Mathematics · Rational Numbers
  1. 2² × 5 × 7
  2. 2 × 5² × 7
  3. 2³ × 5 × 7
  4. 2 × 70
Answer
2² × 5 × 7

The correct answer is 2² × 5 × 7 — Prime factorisation of 140 = 2² × 5 × 7.

Step-by-step solution

  1. 140 ÷ 2 = 70.
  2. 70 ÷ 2 = 35.
  3. 35 ÷ 5 = 7.
  4. Prime factorisation of 140 = 2² × 5 × 7.

Concept tested: Prime Factorisation

Published · How this solution was prepared and checked

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