Number 5 magic

Square the number conatianing 5 in unit place
5 * 5 = 25
15 * 15 = 225
25 * 25 = 625
35 * 35 = 1225
Logic: square the unit place digit i.e is 5, which will be 25. Now increase the 10's place digit i.e 1 by 1 and multiply with 10's place digit (i.e. 2*1) and write answer like this 225. Remember 25 should be written in the rightmost.

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.