To divide \( \frac{1}{10} \) by 4, you can multiply \( \frac{1}{10} \) by the reciprocal of 4. The reciprocal of 4 is \( \frac{1}{4} \).
So the calculation is:
\[ \frac{1}{10} \div 4 = \frac{1}{10} \times \frac{1}{4} = \frac{1 \times 1}{10 \times 4} = \frac{1}{40} \]
Thus, \( \frac{1}{10} \div 4 = \frac{1}{40} \).