When asked to perform the addition of 23 + 17, a class V child immediately responded 40. He/She first added 17 + 3 = 20 and then added the remaining 20 to get 40. Which of the following techniques was used by the child?

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Mathematics · Pedagogy of Mathematics

When asked to perform the addition of 23 + 17, a class V child immediately responded 40. He/She first added 17 + 3 = 20 and then added the remaining 20 to get 40. Which of the following techniques was used by the child?

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Addition by decomposition and completing tens

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When asked to perform the addition of 23 + 17, a class V child immediately responded 40. He/She first added 17 + 3 = 20 and then added the remaining 20 to get 40. Which of the following techniques was used by the child?

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When asked to perform the addition of 23 + 17, a class V child immediately responded 40. He/She first added 17 + 3 = 20 and then added the remaining 20 to get 40. Which of the following techniques was used by the child?

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