what's the square root of 21
A square root is a number times itself. (I believe it's been a while since I've done em)
What's the square root of 21?
Well what times what is 21. Try to work it out. :)
3 times 7 is 21
So the square root of 21 is 3 times 7.
Oh 7 times 3 is also the answer
