Mathematics · Pedagogy of Mathematics
When asked to perform the addition 23 + 17, a class V child immediately responded 40. The child explained that they first added 17 + 3 = 20 and then added the remaining 20 to get 40. Which of the following mental calculation strategies was used by the child?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Addition by associativity property alone
- 2Addition by standard algorithms and guesswork
- 3Addition by decomposition and making tens✓
- 4Addition by sequential counting-on
Correct answer
Addition by decomposition and making tens
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