Divide the numerator (28) by the denominator (8).

$$28 \div 8 = 3 \text{ with a remainder of } 4$$

The whole number part is 3. The remainder is 4. The original denominator is 8.

Both 4 and 8 are divisible by 4.

$$\frac{4}{8} = \frac{4 \div 4}{8 \div 4} = \frac{1}{2}$$

The mixed number is $\boxed{\mathbf{3\frac{1}{2}}}$.

$$36 \div 10 = 3 \text{ with a remainder of } 6$$

The whole number part is 3. The remainder is 6. The original denominator is 10.

Both 6 and 10 are divisible by 2.

$$\frac{6}{10} = \frac{6 \div 2}{10 \div 2} = \frac{3}{5}$$

The mixed number is $\boxed{\mathbf{3\frac{3}{5}}}$.