Multiplication in seconds

multiplication of 15 by any number...

let's say 44 multiply by 15 (44*15) =

do it this way... (44+ 44/2) *10

(44+22)*10= 660

lets take another example

52*15
write it down (52+ 52/2)* 10

(52+26)*10
78*10= 780


Multiplication of 25 by any number

88 multiply by 25
then, divide 88 by 4
88/4= 22
now multiply that 4 by 25 = 100 , so the answer would be 2200


64 * 25

64/4= 16 and 25 *4 = 100 ,so answer is 1600