Question

Which quantity in each of the following pairs is larger? 5.78×101km or 6.43×108cm?

Answer 1

$$1 km = 1000 m = 100000 cm (10^5 cm)$$

$$5.78*101 km = 5.78*101*10^5 cm = 583.78 * 10^5 cm = 5.8378*10^7 cm$$

$$6.43*108 cm = 694.44 cm = 6.9444*10^2cm$$

Obviously, $5.78*101 km$ is a larger numerical value.