Lesson eLearning

If a number from 10 to 20 is increased by 4, the result is 22. What is the original number?

hard 3 marks Class 1 · Mathematics · Numbers from Ten to Twenty
Answer
18

The correct answer is 18 — Answer is 18.

Step-by-step solution

  1. Let the original number be y.
  2. Set up the equation: y + 4 = 22.
  3. Subtract 4 from both sides: y = 22 - 4.
  4. Compute the value: y = 18.
  5. Answer is 18.
Common mistake: Adding instead of subtracting when isolating the variable

Concept tested: Inverse operation of addition

Published · How this solution was prepared and checked

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