[tex]a) \frac{4}{7} + \frac{5}{7} = \frac{4 + 5}{7} = \frac{9}{7} [/tex]
[tex]b) \frac{8}{3} - \frac{6}{3} = \frac{8 - 6}{3} = \frac{2}{3} [/tex]
[tex]c) 6 \times \frac{3}{4} = 3 \times \frac{3}{2 } = \frac{9}{2} [/tex]
[tex]d) \frac{6}{15} \times \frac{5}{3} = \frac{2}{ 3} [/tex]
[tex]e)7 \div \frac{1}{3} = 7 \times 3 = 21[/tex]
[tex]f) \frac{8}{5} \div \frac{2}{15} = \frac{8}{5} \times \frac{15}{2} = 4 \times 3 = 12[/tex]
