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
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
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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