1. Calculate the sum: $\frac{1}{7} + \frac{4}{7} = \text{\_\_\_}$.
2. What is the sum of $\frac{4}{11} + \frac{5}{11}$?
3. Find the sum, which will be an improper fraction: $\frac{5}{8} + \frac{6}{8} = \text{\_\_\_}$.
4. Which expression shows the correct first step to add $\frac{2}{9} + \frac{5}{9}$?
5. A recipe calls for $\frac{3}{10}$ cup of flour and later adds another $\frac{4}{10}$ cup. What is the total amount of flour used? The answer is ___ cups.
6. A student incorrectly calculated $\frac{3}{10} + \frac{4}{10} = \frac{7}{20}$. What was their mistake?
7. Find the sum of three fractions: $\frac{1}{6} + \frac{2}{6} + \frac{2}{6} = \text{\_\_\_}$.
8. Find the sum: $\frac{6}{7} + \frac{5}{7}$.
9. Yesterday, it rained $\frac{3}{8}$ of an inch. Today, it rained another $\frac{4}{8}$ of an inch. What was the total rainfall? The answer is ___ inches.