6) 8 - 5

1. Convert mixed numbers to improper fractions: $$8 = \frac{104}{13}$$, $$5\frac{1}{13} = \frac{66}{13}$$.
2. Subtract the fractions: $$\frac{104}{13} - \frac{66}{13} = \frac{38}{13} = 2\frac{12}{13}$$.