Let's focus on the 10 raised to the 3rd power. That is equivalent to 1,000. In the metric system of the SI unit grams for mass, the prefix that is 1,000 times larger than the base unit of grams is kilo-. Hence, 1,000 grams is 1 kg.
15.7×10³ g * (1 kg/1000 g) = 15.7 kg
