5) $$6 \frac{3}{11} - 1 \frac{1}{45}$$

5) $$6 \frac{3}{11} - 1 \frac{1}{45} = \frac{69}{11} - \frac{46}{45} = \frac{69 * 45}{11 * 45} - \frac{46 * 11}{45 * 11} = \frac{3105}{495} - \frac{506}{495} = \frac{2599}{495} = 5 \frac{124}{495}$$