Chapter 12.1, Problem 2P

Draw a 3-cm-by-7-cm rectangle. Then discuss the difference in the units we attach to the 3 and the 7 in these two situations:

• When applying the rectangle area formula to determine the area of the rectangle.

When viewing the rectangle as decomposed into equal groups of 1-cm-by-1-cm squares in order to apply the definition of multiplication.

Use drawings to support your discussion,