median
don steward
mathematics teaching 10 ~ 16

Sunday, 9 December 2007

forwards add backwards

this neat problem is one of Anita Straker's

the number 726 can be formed by adding a 3-digit number with its reversal:
462 + 264
and there are two other ways to do this

find three ways to do this for
a) 707 (fairly easy)
b) 766.


find the ten numbers between 700 and 800 that can be formed
from a number plus its reversal

what common property do they have?
why?

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