Chapter 4.3, Problem 9P

Write equations to show how the commutative and associative properties of multiplication are involved when you calculate 40. 800 mentally by relying on basic multiplication facts (such as 4.8). Write your equations in the form

   $40.800=\text{some expression}$

     $=:$

     $=\text{some expression}$

Indicate specifically where the commutative and associative