×

# squares of *5 numbers

If there is a number ending with 5 then it's square can be found easily by the following method. For example lets take the number 135. Then to find its square first replace the ending 5 by 25. Then, multiply the remaining number by its successor.(Here, multiply 13 by its successor, i.e., 14) 135^2=(13 * 14)_25 =182 _ 25=18225

Note by Akash Gupta
2 years, 4 months ago

Sort by:

Nice observation. Do you know why this is true? Staff · 2 years, 4 months ago

Means? · 2 years, 4 months ago

Sorry, it should have been "why" instead of "what" (edited).

Do you know how to explain the pattern that you observed? Staff · 2 years, 4 months ago

Ya, I have explained it on my blog. Please refer to it. http://www.brainuser1.blogspot.in/2015/09/square-of-5.html · 1 year, 7 months ago