Answer:
He needs 7/24 cup of milk
Step-by-step explanation:
If he needs 5/8 cup of milk and has 1/3 cup, he will need to subtract so see how much more he needs.
5/8 - 1/3
We need to get a common denominator of 24
5/8 * 3/3 - 1/3 *8/8
15/24 - 8/24
7/24
He needs 7/24 cup of milk