Lesson eLearning

Using the 10‑10‑10 smart chart, what is 73 + 56?

medium MCQ 3 marks Class 3 · Mathematics · Smart Charts
  1. 119
  2. 129
  3. 139
  4. 149
Answer
129

The correct answer is 129 — Therefore, 73 + 56 = 129.

Step-by-step solution

  1. Use the 10‑10‑10 chart which helps add multiples of 10.
  2. Add 70 + 50 = 120 using the chart.
  3. Add the remaining 3 + 6 = 9 using the 1‑1‑1 chart.
  4. Now add 120 + 9 = 129.
  5. Therefore, 73 + 56 = 129.
Common mistake: Neglecting to add the units separately or misreading the chart

Concept tested: Smart chart addition of multi‑digit numbers

Published · How this solution was prepared and checked

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