This example shows the sum 3 7/5 written as 4 2/5. The 7/5 part of the sum can be renamed as 1 2/5 . The 1 in 1 2/5 is added to the whole number 3 for the 4 in 4 2/5: 1 3/5 + 2 4/5 = 3 7/5 = 3 + 1 2/5 = 4 2/5.