8/5 х 5/4 13/6 х 8/3 9/3 x 10/3 8/3 x 12/7

To solve these multiplication problems involving fractions, you can simply multiply the numerators together and the denominators together. Let's solve each one step by step.

1. \( \frac{8}{5} \times \frac{5}{4} \): \[ = \frac{8 \times 5}{5 \times 4} = \frac{40}{20} = 2 \]

2. \( \frac{13}{6} \times \frac{8}{3} \): \[ = \frac{13 \times 8}{6 \times 3} = \frac{104}{18} = \frac{52}{9} \quad (\text{after simplifying}) \]

3. \( \frac{9}{3} \times \frac{10}{3} \): \[ = \frac{9 \times 10}{3 \times 3} = \frac{90}{9} = 10 \]

4. \( \frac{8}{3} \times \frac{12}{7} \): \[ = \frac{8 \times 12}{3 \times 7} = \frac{96}{21} = \frac{32}{7} \quad (\text{after simplifying}) \]

To summarize the results:

1. \( \frac{8}{5} \times \frac{5}{4} = 2 \)
2. \( \frac{13}{6} \times \frac{8}{3} = \frac{52}{9} \)
3. \( \frac{9}{3} \times \frac{10}{3} = 10 \)
4. \( \frac{8}{3} \times \frac{12}{7} = \frac{32}{7} \)