Lesson eLearning

Find the sum of the fractions 11/15 and 2/5.

medium 2 marks Class 7 · Mathematics · Rational Numbers
Answer
17/15

The correct answer is 17/15 — Check that 17 and 15 are coprime, so the fraction is already in simplest form.

Step-by-step solution

  1. Find the least common multiple of 15 and 5, which is 15.
  2. Convert 2/5 to an equivalent fraction with denominator 15: 2/5 = 6/15.
  3. Add 11/15 and 6/15 to get 17/15.
  4. Check that 17 and 15 are coprime, so the fraction is already in simplest form.
Common mistake: Not converting both fractions to a common denominator

Concept tested: Adding fractions with different denominators

Published · How this solution was prepared and checked

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