Acat has a capacity of 642 fl oz. estimate its capacity in cups

In order to do this, we should know that there are 8 oz in one cup. So we then divide 642 by 8, to come up with 80.25 cups. :) To estimate, first we round 642 to the nearest 10. That makes 640. We then divide that by 8 to get 80. 80 is the estimation, 80.25 is the actual answer.

The correct answer is -4