Lesson eLearning

What number added to 13 equals 20?

easy MCQ 3 marks Class 1 · Mathematics · Numbers from Ten to Twenty
  1. 5
  2. 6
  3. 7
  4. 8
Answer
7

The correct answer is 7 — Check: 13 + 7 = 20.

Step-by-step solution

  1. Identify the given number 13.
  2. Let x be the unknown number such that 13 + x = 20.
  3. Subtract 13 from both sides: x = 20 - 13.
  4. Compute the difference: x = 7.
  5. Check: 13 + 7 = 20.
Common mistake: Not subtracting the known number to find the missing number

Concept tested: Addition to reach a given sum

Published · How this solution was prepared and checked

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