3. 5 _ - _ 5. 10

It seems like you have a fraction problem, but I need a little more context or direction to assist you effectively.

Based on what you've presented, you might be looking at these fractions:

\[ \frac{3}{5} - \frac{5}{10} \]

If this is the case, I can help you solve it step-by-step:

1. Find a common denominator: The denominators here are 5 and 10. The common denominator is 10.

2. Convert the first fraction: We need to convert \(\frac{3}{5}\) to have a denominator of 10: \[ \frac{3}{5} = \frac{3 \times 2}{5 \times 2} = \frac{6}{10} \]

3. Now you can subtract: \[ \frac{6}{10} - \frac{5}{10} = \frac{6 - 5}{10} = \frac{1}{10} \]

Thus, \(\frac{3}{5} - \frac{5}{10} = \frac{1}{10}\).

If you meant something different, please provide more details!