Lesson eLearning

Using the 10‑10‑10 smart chart, what is 47 + 39?

easy MCQ 2 marks Class 3 · Mathematics · Smart Charts
  1. 86
  2. 85
  3. 84
  4. 87
Answer
86

The correct answer is 86 — Check the sum: 47 + 39 = 86.

Step-by-step solution

  1. Use the 10‑10‑10 chart to add the units: 7 + 9 = 16 → write 6 and carry 1 to tens.
  2. Add the tens: 4 + 3 + carried 1 = 8.
  3. Combine the results: 8 (tens) and 6 (units) gives 86.
  4. Check the sum: 47 + 39 = 86.
Common mistake: Forgetting to carry the extra 1

Concept tested: Smart Chart addition

Published · How this solution was prepared and checked

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