A perfect square is a number that can be written as the square of
some other number. But, what does that mean?? It's simple.
9 is a square number because it can be written as 3x3, or 3².
25 is also a square number because it can be written as 5x5, or 5². When building with tiles, square numbers always
have the same length and width, which means they form a square. Can you list the first perfect squares from 1 to 10?