CPM Homework Help : MC2 Problem 9-51

The area of a rectangle is $42$ cm². If the length and width each grow four times longer, what will the new area be?

Hint:

Make an example of a rectangle with an area of $42$ cm².
Since the area of a rectangle is (base)(height), which two numbers multiplied together gives $42$ ?

A rectangle 6 by 7 centimeters

More Help:

Multiply base and height by $4$ .

A rectangle 24 by 28 centimeters

More Help:

Now find the area of the larger rectangle by multiplying the new base and the new height.