1. **State the problem:** Multiply 1.28 by 5. 2. **Formula used:** Multiplication of decimals by whole numbers is done by multiplying as if they were whole numbers and then placing the decimal point in the product. 3. **Multiply:** $$1.28 \times 5 = ?$$ 4. **Calculate:** $$1.28 \times 5 = 6.40$$ 5. **Explanation:** Multiplying 1.28 by 5 means adding 1.28 five times or directly multiplying. The decimal point stays two places from the right because 1.28 has two decimal places. **Final answer:** $$\boxed{6.40}$$