Magic Gopher explained

Try !!!

http://www.learnenglish.org.uk/games/magic-gopher-central.swf










Explaination:
When you have a 2 digit number then add them together and then subtract the new number from the orignal; you get multiplication table of 9x


Eg:
40 - (4 + 0) = 0
19 - (1 + 9) = 9
23 - (2+3) = 18
41 - (4 + 1) = 36
...

You can see the partern of a 9x multiplication table. Now go back to the game. See the symbol and take note of the numbers 0, 9 , 18, 27, 36, 45. They are all the same.
:)