Lesson eLearning

Using the 1‑1‑1 smart chart, find the sum of 154, 89, and 67.

hard 4 marks Class 3 · Mathematics · Smart Charts
Answer
310

The correct answer is 310 — Check: 154 + 89 + 67 = 310.

Step-by-step solution

  1. Add the units using the 1‑1‑1 chart: 4 + 9 + 7 = 20 → write 0 and carry 2 to tens.
  2. Add the tens: 5 + 8 + 6 + carried 2 = 21 → write 1 and carry 2 to hundreds.
  3. Add the hundreds: 1 + 8 + 6 + carried 2 = 17.
  4. Combine the columns: 17 (hundreds), 1 (tens), 0 (units) → 310.
  5. Check: 154 + 89 + 67 = 310.
Common mistake: Ignoring the carry from units to tens

Concept tested: Smart Chart addition

Published · How this solution was prepared and checked

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