Consider the question. Ten boys brought 15 popsicle sticks each. Twelve girls brought 12 popsicle sticks each. How many fewer popsicle sticks did the girls bring than the boys?
 If the answer is '6'; explain the reasoning:
The boys brought a total of 10 x 15 = 150 popsicle sticks. The girls brought a total of 12 x 12 = 144 popsicle sticks. Therefore, the girls brought 150 - 144 = 6 fewer popsicle sticks than the boys.