Education · Mathematics Pedagogy
When posed with a subtraction problem, '400 - 45', a student responded: "If it were 40, then the answer would be 60, but it's 45 so it's 55, 155, 255, 355; therefore, 400 - 45 is 355." Which one of the following statements is correct regarding the strategy used by the student?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Only the standard algorithm is desirable for solving such problems, hence it is an incorrect method.
- 2It is an informal algorithm and reflects the student's mathematical thinking process.✓
- 3The student should get zero marks for using this strategy to solve a problem based on subtraction.
- 4It is a hit-and-trial method of solving a problem.
Correct answer
It is an informal algorithm and reflects the student's mathematical thinking process.
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