Multiply 871 21.8 4B646F

1. **State the problem:** Multiply $871$ by $21.8$. 2. **Formula used:** Multiplication of two numbers: $$a \times b$$ 3. **Calculate:** $$871 \times 21.8 = 871 \times (20 + 1.8) = 871 \times 20 + 871 \times 1.8$$ 4. **Intermediate calculations:** $$871 \times 20 = 17420$$ $$871 \times 1.8 = 1567.8$$ 5. **Add the results:** $$17420 + 1567.8 = 18987.8$$ 6. **Final answer:** $$871 \times 21.8 = 18987.8$$