The Babylonians would have added 2/3 and 1/4 by adding
4/6 + 2/8
40/60 + 10/60
40/60 + 15/60
They could not have added the two fractions because 2/3=0.6666..., a repeating decimal.
The Babylonians would have known that the Babylonian fractions for 2/3 + 1/4 add up to
less than one whole, since the numerators add up to less than 60
exactly one whole, since the numerators add up to 60
more than one whole, since the numerators add up to more than 60