## Subtracting Fractions: 1 1/3 Cup - 2/3 Cup

This problem involves subtracting fractions, and it's a common task in cooking and baking. Here's how to solve it:

### Understanding the Problem

We need to find the difference between 1 1/3 cups and 2/3 cups.

### Converting to a Mixed Number

First, let's convert the mixed number 1 1/3 into an improper fraction:

- Multiply the whole number (1) by the denominator of the fraction (3): 1 * 3 = 3
- Add the numerator of the fraction (1): 3 + 1 = 4
- Keep the same denominator: 4/3

Now our problem is: **4/3 - 2/3**

### Subtracting Fractions with the Same Denominator

Since the denominators are the same, we can simply subtract the numerators:

- 4/3 - 2/3 =
**2/3**

### The Answer

Therefore, 1 1/3 cup minus 2/3 cup is **2/3 cup**.