Find the area of shapes quiz online. This is an interactive online math activity in which children will calculate the area of different squares and rectangles. The basic formula for finding the area in this case is the length times the width. Also, they will learn how to find the area of a shape by counting squares. That is another method that introduces kids to the notion. Get more practice by downloading worksheets focused on finding the area of shapes under the printable section. This activity is for kids in 2nd, 3rd, 4th, 5th grades.