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Take for example, a 2 digit number: 72Let X be 7 and Y be 272 would be 10X+YWhen adding the 2 numbers together, for example 7+2, it would be X+Y. 10X+Y - X+Y = 9XSince it is 9X, the final answer would definitely be a multiple of 9. So, the final symbol would be the symbol next to a number with a multiple of 9.
Excellent Answer!Just note the representation for 10X+Y - X+Y should be written as (10X+Y) - (X+Y)The 2nd bracket for (X+Y) is important as that accounts for the change of the "sign".10 points for Group 4 :)
The symbols of numbers will change
YAYYYYY 10 points for Grp 4 GJ roy! :)