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
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