640 km to m conversion result above is displayed in three different forms: as a decimal (which could be rounded), in scientific notation (scientific form, standard index form or standard form in the United Kingdom) and as a fraction (exact result). Every display form has its own advantages and in different situations particular form is more convenient than another. For example usage of scientific notation when working with big numbers is recommended due to easier reading and comprehension. Usage of fractions is recommended when more precision is needed.
If we want to calculate how many Meters are 640 Kilometers we have to multiply 640 by 1000 and divide the product by 1. So for 640 we have: (640 × 1000) ÷ 1 = 640000 ÷ 1 = 640000 Meters
So finally 640 km = 640000 m
