Answer:
The product is a final result to an equation.
The sum is found by doing addition.
I need to know what the dimensions of the rectangle are, but a simplified version of it is
Algebra tiles- you ADD them up as they are to make an equation.
Generic Rectangle- You write your problems into the boxes (however many are given), then you put your answers into the boxes. You, lastly, add them up to get the SUM
