The ending digit of square number is either 0, 1,4,5,6 or 9 only.
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Here you are.A handy tip to get the next square when you have one you know the square root of ....If you know X and X2 , then the square of (X+1) = X2 + X + (X+1)149162536496481100121144169196225256289324361400
Yes it is. Do you want to know something spectacular? Well, it's not too great. But if you switch 21 around to make 12, 12 is the square root of 144, which has the same numbers as 441! Isn't that cool. So if you know what 12 is the square root of, you know what 21 is the square root of. WARNING: THIS DOES NOT WORK WITH ALL NUMBERS!!!!!!!!!!!!
82
It will be easier to know what to write
23 times 23 is 529. :) i know i hate finding the square root of large numbers to.