Hi fellow Brilliantians out there! As any kid studying for a competitive exam, an arsenal of vast number of tricks, which make calculations simple, is a must. Why not try & write some of these here in this feed?
Here are some of mine -
Do it this way!
Hey presto! You got the right answer!
Take another one-
Just Brilliant! (Pun intended).
Take the case of .
1. Take the number other than 5 & consider it as a whole (in this case 14).
2. Multiply it by its consecutive integer (here ).
3. Join 25 at the back of the number you just got (here 21025).
And that, my dear friend, is the answer! (Check if you don't believe me!).
Remember: This is only valid for the squares of integers ending with 5.
I hope to add more!