Fractions

Convert to improper fraction $$6\ \frac{8}{11}=...$$  

$$\frac{2}{5}+\frac{3}{10}=...$$  

$$4\frac{5}{6}+5\frac{3}{5}=...$$  

$$\frac{7}{9}-\frac{1}{4}=...$$  

$$1\frac{1}{2}\times3\frac{2}{3}=...$$  

$$2\frac{1}{4}\div1\frac{2}{3}=...$$  

Wong is making a shelf from two pieces of wood. The first piece is $$1\frac{1}{4}\ m$$   long, the second is $$1\frac{4}{5}$$   long. He fixes them on a wall. What is the total length of the shelf?

Thoriq has a rectangular garden. The length of garden is $$20\frac{5}{7}\ m$$  . The width of garden is $$10\frac{1}{2}\ m$$  . Calculate the area of Thoriq's Garden in $$m^2$$  !