96*96 = 100*96 - 4*96 =9600 - 4*(100-4))= 9600-400+16 =9216
(100-n)²=10000-200n+n²
(90+6)²=90²+6*90*2+6²
This trick will only be useful when I forget to bring my calculator during an exam
91^2=8,281 The method would put it as this as well
Is true only for the 90th group?
But what if number is like 78
Its not working with 91 and also with 97. I mean what method is this anyway???!!! Shortcut in math must have a reason and logic behind it. 97x97 is 9409. And NOT 9449 as this method says. Please, delete this awful video from YouTube and don't teach math ever again. Math teacher
Why can’t we just write down 96x96 Simple and fast
Tried to use this on a lower number like 15 except I don’t know 85 squared, so using this method 100 takeaway 85 is 15 so now to find what 15 squared is I need to know 15 squared 🧌
@Azhar_9212