My class watched Abbot and Costello and they were stuck in the math problem 7X4. Which equels 28. But Costello said that it was 7X13 that equaled 28. But the problem problem 7X13 equals 91. one of the other ways that you can divide 13 and 28 and see what it comes out as. and the answer to that is 2 remainder 2. So Costello was way off on that problem.