Just like any other time you want to convert units, multiply
what you're starting with by fractions that are all equal to ' 1 '.
('M' miles) · (5,280 ft/mile) · (1 meter / 3.28 ft) · (100 centimeters/meter)
= 'M' times 160,934.4 centimeters
or
= 'M' divided by 0.000006214 centimeters
