How to find Multiply two digit number ending 1/ great trick in second

Some condition is satisfy for this problem like if two multiplication number ending is one required ex. 21×31 ,51×71,101×151
That type of problem this condition is satisfy for solve this some steps is apply
Step 1:- multiply the leftmost digit
Step 2:- add left most digit
Step 3:- place the result from step 2. Next to               the result step 1
Step 4:-place the 1 next to the result step 3

Ex:- 51 × 21 =1071
       Step 1:- 5×2 = 10
       Step 2 :- 5+2 = 7
       Step 3 :- 10_7 .......107
       Step 4 :-  107_1
 So we have find answer that is 1071

If step 2 answer is two digit then  this digit leftmost digit add in the step 1 answers
Ex . 71 × 151
      Step 1 :-  7× 15=105
      Step 2 :-  7+15=22
      Step 3 :-. 105_22. Then left most digit of                            step 2 that is 2 add in 105
                       =105+2
                       =107
                       =107_2
                       =1072
      Step 4 :- 1072_1
                      10721
I have show some problems for practice try this


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