don steward
mathematics teaching 10 ~ 16

Sunday, 16 June 2013

front to back

you could start these tasks by exploring what happens to a 2-digit number when the front digit is put to the back and the two numbers are (a) added and (b) subtracted

and what happens with a 2-digit number if you square them first and then subtract?

establish that the result will always divide by 9 and by 11

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