User:Amountkeg/sandbox

This article is just to show how to simply calculate the square of any integer ending five example (5)^2 = 25 and (15)^2 = 225 Let X=5 and Y be a number that comes before X example such as 45, Y=4 and X=5 Then YX is the number we want to find the square of. We know that the square of any number ending 5 has the last two digits 25 therefore the square of YX = (Y x Y + Y)"X x X" Example 1. Find the square of 25 (2x2)=4 4+2=6 then attach the last two digits of 25 to the number making 625 25x25=(2x2+2)"25" Example 2. Find the square of 75 7x7=49 49+7=56, then attach the last two digits 25 to the number making 5,625 75x75=(7x7+7)"25" By Kingsley Eshun Gyekye Msc in Computer Science and Mathematics Lobachevsky State University of Nizhni Novgorod, Russia Tel:+79200610980