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**Could you UNCOVER THE MYSTERY behind the crystal ball?**

**(in the Algebraic way!)**

**Submit your explanation under comments...**

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ReplyDeleteTake for example, a 2 digit number: 72

ReplyDeleteLet X be 7 and Y be 2

72 would be 10X+Y

When adding the 2 numbers together, for example 7+2, it would be X+Y.

10X+Y - X+Y = 9X

Since 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!

DeleteJust 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

ReplyDeleteYAYYYYY 10 points for Grp 4 GJ roy! :)

ReplyDeleteYAYYYYY 10 points for Grp 4 GJ roy! :)

ReplyDelete