Lesson eLearning

Find the number that when increased by 4 becomes 15.

medium 3 marks Class 1 · Mathematics · Numbers from Ten to Twenty
Answer
11

The correct answer is 11 — Therefore the number is 11.

Step-by-step solution

  1. Let the unknown number be .
  2. Set up the equation .
  3. Subtract 4 from both sides: .
  4. Compute: .
  5. Therefore the number is 11.
Common mistake: Adding instead of subtracting 4 from both sides

Concept tested: Solving a simple linear equation

Published · How this solution was prepared and checked

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