You're going to divide 1/3 gal of paint by 10 students.
1/3 ÷ 10
Use the Keep, Change, Flip method.
Keep the 1/3.
Change the ÷ sign to a × sign.
Flip the 10 (10/1) to 1/10.
Your new equation looks like this: 1/3 × 1/10.
Multiply.
1/3 × 1/10 = 1/30
Each student got 1/30 gallon of paint.