How do you find the square root of 361?
See explanation for a few methods...
One of the best ways to attempt to find the square root of a whole number is to factor it into primes and identify pairs of identical factors. This is a bit tedious in the case of
Let's try each prime in turn:
Approximation by integers
Subtract half that percentage from the approximation:
The "half that percentage" bit is a form of Newton Raphson method.
Hmmm, I know some square roots already
Hey! I know that already:
Knowing a few squares is useful for all sorts of mental calculation, so I would recommend memorising them a bit. In fact you can multiply two odd or two even numbers using squares, adding, subtracting and halving as follows: