1) Multiply 2 digit number by 11
Let us multiply 72 by 11 using Vedic Mathematics trick.
Step 1: Split 72 as follows:
7_2
Step 2: Add 7 and 2, and write addition in between 7 and 2. So will get our answer as
792
Thus 72*11=792
Now, what if addition becomes two digit number. In such case, we just need to add 1 in the adjacent left digit. Let us take another example for this condition.
Multiply 85 by 11.
Step 1: Split 85 as follows:
8_5
Step 2: Add 8 and 5 and write addition in between them. But here addition becomes 13 and if we write 13 in between 8 and 5 answer become 8135 which is wrong. So in such situations, we need to write only 3 (from 13) and add 1 in 8. See below example.

2) Multiply 3 digit number by 11
Let us multiply 345 by 11
Step 1: Split 345 as follows
3 _ _ 5
Step 2: Add (3+4) and (4+5) and write in between 3 and 5. So we will get our answer as
3795
Thus 345*11=3795
Now, what if addition becomes two digit number. In such case, we just need to add 1 in the adjacent left digit. Let us take another example for this condition.
Multiply 849 by 11
Step 1: Split 849 as follows
8_ _9
Step 2: Add (8+4=12) and (4+9=13) and write in between 8 and 9. But here addition is two digit numbers (12 and 13) so we need to add 1 in adjacent left digits as follows.
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