The attribute that they have one square root which belongs to the set of natural numbers.
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you find it by adding up the numbers of cm " in a square
You find the same two numbers that make the number, then you use one of those numbers for your square root.
You can. Just add the numbers together, and find their square root. One plus three is four; the square root of the sum is two.
Imaginary numbers are only ever used when you are using the square roots of negative numbers. The square root of -1 is i. You may find imaginary numbers when you are finding roots of equations.
Guess and check to find two numbers that equal 45.