Directions: Use the digits 1-9 each once to make a the largest possible sum.
What assumptions are we making about the fractions we are able to use? Do fractions have to be in lowest terms? How can we figure out if we want the larger numbers to be part of the addends or sum?
There are many answers in the comments below. One I got was 9 2/4 + 5 3/6 = 7 8/1
Source: Robert Kaplinsky and Ellen Metzger