you can open PDF
[tex] \frac{4}{5} + \frac{2}{3} [/tex]

[tex] \frac{4}{5} + \frac{2}{3} \\ \frac{4 \times 3}{5 \times 3} + \frac{2 \times 5}{3 \times 5} \\ \frac{12}{15} + \frac{10}{15} \\ = \frac{22}{15} \: or \: 1 \frac{7}{15} [/tex]