XX x 11 (any number times with 11)

Formulas :

add 0 at the start and end of the number.


Example :

11 × 23125 = 0231250


Divide them to 2 in a group.

0 + 2 = 2

2 + 3 = 5

3 + 1 = 4

1 + 2 = 3

2 + 5 = 7

5 + 0 = 5


So, 11 × 23125 = 254375