Beauty of Mathematics

Multiplication Tricks: Multiplication between 11&19: e.g 11*12=132 brief: 1st step:11+2=13; 2nd step:13*10=130; 3rd step:130+(1*2)=132; Multiplication between 21&29: e.g 22*25=550 brief: 1st step:22+5=27; 2nd step:27*20=540; 3rd step:540+(2*5)=550; Similarly For 31to39 multiply by 30 in 2nd step; For 41to49 multiply by 40 in 2nd step,; remaining all the steps are same as above...........