SHORTCUT to multiply with 9

HEY do you know there is shortcut to multiply a number with 9

step 1: Consider this number 123 multiply with 9 .

step 2 : Inorder to do this add 0 to123 then it will 1230

step 3 : Then suntract 123 (Look step 2) from it ,1230-123=1107 This is answer that's all.

(123*9=1107)

N.B: Rather than 9 if 99 is to be used we have to add double 0's to 123.

Then try yourself .