Multiply two numbers which have 1 in their units digit>>>>

Step 1 

In the result the units digit is definitely 1 ( as all of you know….Obviously)

Step 2

The second digit can be acquired by adding the two numbers
(excluding the units digit i.e 1) 

Step 3

The third digit can be acquired by multiplying the two numbers
(excluding the units digit i.e 1) 

Ex:

Lets say we are multiplying 21 and 31

1)The first digit (units digit) is 1 by default

_ _ 1

2) The second digit is obtained by adding the two numbers excluding the units digit i.e 1 
There fore the second digit of the result is 2+3 = 5

_ 5 1

3) The Last digit is obtained by multiplyin the two numbers in the question >>> i.e 2 & 3

6 5 1

And hence the answer 651

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