Final answer:
To make 2 5/8 equal to 6, you need to add 3 3/8.
Step-by-step explanation:
To find out what you need to add to 2 5/8 to make it 6, you can set up a simple equation. Let x represent the amount you need to add. So the equation is 2 5/8 + x = 6. To solve for x, first convert 2 5/8 into an improper fraction, which is (8 * 2 + 5)/8 = 21/8. Now you have 21/8 + x = 6. To find x, you need to subtract 21/8 from 6, which is the same as subtracting 21/8 from 48/8 (since 6 equals 48/8).
Subtracting 21/8 from 48/8 gives you 27/8. Thus, x = 27/8, which can also be written as 3 3/8 when converted back to a mixed number.
So to make 2 5/8 equal to 6, you need to add 3 3/8.