This is an easy way to multiply numbers by 11

Case 1 (Simple 2 digit numbers)

Let us use 34 for example

1) Split the two digits in your head

**3**X**4**

The answer will look like that

2) To figure what the X is

Add the 3 and the 4 together (3+4=7)

Replace the X by this sum(7)

3**7**4

Your answer is **374**

Case 2 (2 digit numbers with a carry)

In this case the sum of the two numbers is greater than 9

Let us use 76 for example

1) Split the two digits in your head

7**X**6

The answer will look like that

2) To figure what the X is

Add the 7 and the 6 together (7+6=13)

Replace the X by this sum (13)

7**13**6

3) Clearly this answer is not correct, as it has to be a 3 digit number.

Take the extra 1 that has occurred from the sum being greater than 9 and add it to the 100s number (7)

7**13**6 -> 7** ^{1}3**6 -> 836

Your answer is 836

View bellow a couple of examples