Lesson eLearning

What is the sum of 27 and 18?

hard 2 marks Class 1 · Mathematics · Addition
Answer
45

The correct answer is 45 — The sum is 45.

Step-by-step solution

  1. Write the numbers vertically: 27 and 18.
  2. Add the ones digits: 7 + 8 = 15.
  3. Write 5 in the ones place and carry over 1 to the tens place.
  4. Add the tens digits plus the carry: 2 + 1 + 1 = 4.
  5. The sum is 45.
Common mistake: forgetting to carry the 1

Concept tested: Addition with carry

Published · How this solution was prepared and checked

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