Number 11 magic

Dear friends Can you multiply 11*11, yes, it is very simple, 121. Great.

Can you multiply 111 * 111 little difficult whta?

111 1111

*111 *1111

---------- --------------

111 1111

111 1111

111 1111

--------- 1111

12321 --------------

1234321

Could you relaize any thing? No? No problem here is the tricks:

11 * 11 = 121

111 * 111 = 12321

1111 * 1111 = 1234321

1111 * 1111 = 123454321

If two's 1 then result will go 12 and return to 1

If three's 1 then result will ascent to 123 and descend to 21 means 12321

similary for 9's 1 result will be 12345678987654321.