Short trick:
(L2+L)|R1xR2
Multiply 24 and 26
Here left digit of both 24 and 26 is 2. and sum of right digits is 10(4+6).
therefore L= 2, R1=4 and R2=6
Solution:
(L2+L)|R1*R2
=22+2|4*6
=4+2|24
=6|24
=624
Note: if R1xR2<10 then add ’0’ before result of R1xR2.
Lets Multiply 91 and 99
Here left digit of both 91 and 99 is 9. and sum of right digits is 10(1+9).
therefore L= 9, R1=1 and R2=9.
Solution:
(L2+L)|0R1*R2
=92+9|01*9
=81+9|09
=90|09
=9009