Neha was solving a problem that required the subtraction of 673 - 257. She explained, '257 plus 100 will be 357, 457, 557, 657. So, 257 plus 400 is 657. Now 657 plus 10 is 667, 677, so, 657 plus 20 is 677, and 4 less than 677 is 673. Therefore, 400 plus 20 minus 4 is 416.' Hence, 673 - 257 = 416. Which of the following statements is most appropriate regarding Neha's strategy?

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Mathematics · Pedagogy

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

It shows Neha is able to use her conceptual understanding of addition and subtraction in developing her own personal algorithm.

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Answer 1

It is an informal strategy, hence it cannot be used in written tests.

Answer 2

Neha is unnecessarily mixing the concept of addition in solving a problem on subtraction.

Answer 3

Neha does not know the formal algorithm of subtraction.

Answer 4

It shows Neha is able to use her conceptual understanding of addition and subtraction in developing her own personal algorithm.

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