1. **State the problem:** Calculate $4 \div 0.25$. 2. **Recall the division rule:** Dividing by a decimal is the same as multiplying by its reciprocal. 3. **Convert the division to multiplication:** $$4 \div 0.25 = 4 \times \frac{1}{0.25}$$ 4. **Calculate the reciprocal:** $$\frac{1}{0.25} = 4$$ 5. **Multiply:** $$4 \times 4 = 16$$ 6. **Final answer:** $$4 \div 0.25 = 16$$