Question

Teresa measures the dimensions of her math book. It is 28 centimeters long and 21 centimeters wide. How can Teresa find the perimeter of her math book?

Answer 1

It is length times width so you will have to do 2(28)+2(21)

Answer 2

The perimeter of a shape is its length+width+length+width, or 2L+2W :).

So, in order to find the perimeter of Teresa's math book, she can add 2(28)+2(21).

Hope I helped! :)