How make Multiplication fast : Part I

Multiplication of two digits


 Type1–   If last digit of both No. SUM is 10 and First digit is SAME no.
                                                                 
                                                   68*62
Tricks:   

Step 1-   First we multiply last digit of both no. here 8 and 2 are last digit
                                                           
                                                           8*2 =16———-(1)

Step 2-  First digit of both No same.. here it is
         now we find next no. after 6 ...is 7 so we multiply with 6*7
                                              =42———-(2)

         at Last your final answer is =        4216

Type 2- If SUM of First digit of both No. is 10 and Last digit of both No. SAME 

                                                               69*49
Tricks: 

Step1-  Multiply (Square) last Same No. Here is 9
                                           9*9=81——— (1)

Step 2- Multiply first digit of both No . then add Last digit (Same No.)

                                                               6*4+9=33——-(2)

Now at last your answer is-       3381

     


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