Arrange fractions in descending order

Answer: Option B

Explanation:

$$\begin{aligned} 0.5\overline{6} = \frac {56 - 5}{90} = \frac {51}{90} \end{aligned}$$

Answer: Option A

Answer: Option C

Explanation:

1/0.04 = (1 * 100)/4 = 100/4 = 25

Answer: Option C

Explanation:

Can be easily solved with following formula
$$\begin{aligned} a^2 - b^2 = (a - b)(a + b) \end{aligned}$$

Answer: Option A

Explanation:

$$\begin{aligned} 6.\overline{46} = 6 + 0.\overline{46} = 6 + \frac{46}{99} = 6\frac{46}{99} = \frac{640}{99} \end{aligned}$$