Answer:
If you add 3 1/2, 1 1/8 and 4 3/8 you will get a whole number.
Explanation:
All of the numbers have a common denominator, 24, so we can make the denominator all 24.
3 1/2 = 3 12/24
1 1/8 = 1 3/24
2 7/12 = 2 14/24
4 3/8 = 4 9/24
Now which of these numbers added will become a whole number?
As you can see if you add 3 12/24, 1 3/24, and 4 9/24 you will get a whole number.