Quick trick to uncover multiplication closest 100,200,300..900 Lets attempt it with handful of examples below. Illustrations with Base a hundred 1) Think about two numbers earlier mentioned one hundred, like 102 and 107. i. 102 is two far more than one hundred and 107 is 7 far more then one hundred. ii. Multiply these two quantities ie two*seven=14 to get the ending digits of the remaining end result iii.