Draw a generic rectangle to help you calculate each product. For each part, write: (total dimension)(total dimension) = sum of individual area parts = total area. For example, the diagram at right shows that
Think back to the way you solved the generic rectangles in class. Change 73 to 70 + 3. Change 42 to 40 + 2.
Part of the rectangle has been filled in for you.
This one is solved just like the one above. Remember to add a hundreds place column.