2 1/3 + 1 1/3
$$2 \frac13 + 1 \frac13 \\\\= 2 + \frac13 + 1 + \frac13 \\\\= 2 + 1 + \frac13 + \frac13 \\\\= 3 + \frac13 + \frac13 \\\\= 3 + 2\cdot \frac13 \\\\= 3 + \frac23 \\\\= 3 \frac23$$