Q . 255 * 11

STEP 1 :

First we will take the first and last digit of the number as first and last digit of the answer:
2 5 5

2 5

STEP 2 :

Now add last two digit of the number that is 5 and 5 and also add the carry if have any
so 5 + 5 = 10 and carry will be 1
2 5 5

20 5

STEP 3 :

Now add first two digit of the number that is 2 and 5 and also add the carry if have any
so 2 + 5 = 7
2 5 5

2705
Add the carry if we have any in first digit.

The result will be 2705