CTET Class I to V 27 Dec 2021 Paper

Question : 58 of 150

Marks: +1, -0

When posed with a problem on subtraction, '400 - 45', a student responded. “If it were 40, then the answer would be 60, but its 45 so its 55, 155, 255, 355, therefore, 400 - 45 is 355.”
Which one of the following statements is correct for the strategy used by the student?

Only standard algorithm is desirable for solving such problems, hence it is an incorrect method.
It is an informal algorithm and reflects student's mathematical thinking process
The student will get zero marks for using this strategy to solve a problem based on subtraction
It is a hit and trial method of solving a problem

Validate

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