Nina wants to put color tiles on a square. 3 color tiles fit acroos the top of the square. how many rows and colum of tiles will nina need. how many square tiles will she use in all

She will use 3 rows of 3 squares, for a total of 9 squares.

Since the shape she is covering is a square, all of the sides are equal. If 3 square tiles fit across the width of the top, then 3 square tiles fit across the length of it as well. This makes 3 by 3, or 9 squares.