**STEP 1:**Square of the first digit of the greater number

**STEP 2**: Substract 1 from Square

**STEP 3**: Add 75 in last

**Example:**

25*35= Square of the first digit(3^2=9) of the greater number(35) - 1 = 8

and then 75.=. 875

35*45 = 4^2-1 = 16-1 =1575

15*25 = 2^2-1 = 3 =375

35*45 = 4^2-1 = 15 =1575

55*65 = 6^2-1 = 35 =3575

25*35= Square of the first digit(3^2=9) of the greater number(35) - 1 = 8

ReplyDeleteand then 75.=. 875

35*45 = 4^2-1 = 16-1 =1575

15*25 = 2^2-1 = 3 =375

35*45 = 4^2-1 = 15 =1575

55*65 = 6^2-1 = 35 =3575

same way for 3 digits

Example:115*125 first 2 digits of greater number 12 multiply with same digits(12*12) =144 - 1 = 143 and then 75 = 14375