Select the best word to complete each sentence.

Step 1: - Add the fractions $\frac{3}{5} + \frac{2}{5}$.

Common denominator is 5.

$$\frac{3}{5} + \frac{2}{5}$$

Add numerators.

$$\frac{3+2}{5} = \frac{5}{5} = 1$$

$\boxed{1}$

Step 2: - Add the fractions $\frac{1}{4} + \frac{3}{4}$.

Common denominator is 4.

$$\frac{1}{4} + \frac{3}{4}$$

Add numerators.

$$\frac{1+3}{4} = \frac{4}{4} = 1$$

$\boxed{1}$

Step 3: - Subtract the fractions $\frac{5}{6} - \frac{1}{6}$.

Common denominator is 6.

$$\frac{5}{6} - \frac{1}{6}$$

Subtract numerators.

$$$$