Multiplication of Two digits –

Dear Frnds
    We are already discuss multiplication of two digits base method.  Now we are discuss multiplication two digit with special numbers ….
Multiplication Method If both numbers near 100’s
Example. 
Find out value  91 × 98 (just in 3 Second)
See how.  …..    91×98

     
Step1– Both numbers compare with 100
          Here 100-91.. and.. 100-98
               Get =9….       and….  2
Multiplication of these no.
                            9×2=18
Step 2- Subtract… from numbers
              ie 91-2…. and.. 98-9
                 =89….and .. 89
Here you get same value ….
Step 3-   from step 2 and 3
       Ans is write as.– 8 9 1 8

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