Mixed Number Sum
1. **State the problem:** Calculate the value of $2 \frac{3}{4} + 3 \frac{2}{3} - 1 \frac{2}{3}$.
2. **Convert mixed numbers to improper fractions:**
- $2 \frac{3}{4} = \frac{2 \times 4 + 3}{4} = \frac{11}{4}$
- $3 \frac{2}{3} = \frac{3 \times 3 + 2}{3} = \frac{11}{3}$
- $1 \frac{2}{3} = \frac{1 \times 3 + 2}{3} = \frac{5}{3}$
3. **Rewrite the expression with improper fractions:**
$$\frac{11}{4} + \frac{11}{3} - \frac{5}{3}$$
4. **Find a common denominator:**
The denominators are 4 and 3. The least common denominator (LCD) is 12.
5. **Convert each fraction to have denominator 12:**
- $\frac{11}{4} = \frac{11 \times 3}{4 \times 3} = \frac{33}{12}$
- $\frac{11}{3} = \frac{11 \times 4}{3 \times 4} = \frac{44}{12}$
- $\frac{5}{3} = \frac{5 \times 4}{3 \times 4} = \frac{20}{12}$
6. **Perform the addition and subtraction:**
$$\frac{33}{12} + \frac{44}{12} - \frac{20}{12} = \frac{33 + 44 - 20}{12} = \frac{57}{12}$$
7. **Simplify the fraction:**
Divide numerator and denominator by their greatest common divisor (GCD), which is 3:
$$\frac{57 \div 3}{12 \div 3} = \frac{19}{4}$$
8. **Convert back to a mixed number:**
$$19 \div 4 = 4 \text{ remainder } 3$$
So,
$$\frac{19}{4} = 4 \frac{3}{4}$$
**Final answer:** $4 \frac{3}{4}$