1. **State the problem:** Multiply 12 by 64. 2. **Formula used:** Multiplication of two numbers $a$ and $b$ is given by $a \times b$. 3. **Calculate:** $$12 \times 64 = 768$$ 4. **Explanation:** Multiplying 12 by 64 means adding 12 to itself 64 times or vice versa. The product is 768. 5. **Final answer:** $768$