What direction does the decimal move from Kilometers to millimeters?

When converting from kilometers to millimeters, the decimal moves three places to the right. This is because there are 1,000 millimeters in a single centimeter and 1,000 centimeters in a kilometer, resulting in a total of 1,000,000 millimeters in a kilometer. Thus, for every kilometer, you multiply by 1,000, leading to the rightward movement of the decimal.