Betsy and Martin were challenged to select two mixed numbers from the set below that resulted in the largest sum. 8 7/400, 8 5/9 , 8 98/210, 8 12/13 Betsy selected 8 12/13 and 8 98/210 because "The whole numbers are all the same so I selected the mixed numbers with the largest numerators."

Martin selected 8 7/400 and 8 98/210 because "The whole numbers are all the same so I selected the mixed numbers with the largest denominators."

Part A: Is Betsy correct and how do you know?

Part B: Is Martin correct and how do you know?

Part C: Which two mixed numbers would result in the largest sum?