median
don steward
mathematics teaching 10 ~ 16
Saturday, 12 February 2011
deletions
choose any number (circle it) and cross out the other numbers in the same row and column as this
then do this again
and do it a third time
then put a circle round the remaining number and add up the four numbers
do this a couple of times
what happens?
why does it happen?
[ idea from Mathematics in School, January 1989 ]
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