don steward
mathematics teaching 10 ~ 16

Tuesday, 1 March 2011

take to times

work out these fraction subtractions

then replace the subtraction sign with a multiplication sign
and work these out

try to find some other examples or find patterns

try to prove any general rules

there are other generalities with the same property:

prove that this subtraction (family) has the same result if the subtraction is replaced by a multiplication sign

and this one:

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