I need a help from maths teachers.
My dc says her teacher taught the children the answer is 81. And when she has done the work on online maths programme, it's wrong obviously.
I have explained, it's -81, since it's really - (92). And to get answer as 81, the question need to be (-9)2, not -9^2. But being not a maths specialist, cannot explain why in a logical way , and the child blatantly believes the teacher, which is a good thing, but not really if the teacher is wrong.
How do you maths teachers explain this to your students?
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-9^2 = -81
192 replies
insufferablefury · 02/12/2019 18:27
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