An easy way to work with the metric system is to build yourself a table, and eventually memorize the places on that table. The units of the table are usually as such:
Kilo | Hecto | Deka | Meter/Liter/Gram | Deci | Centi | Milli
Try to remember the values of the table; kilo is one-thousandth of your base unit, whereas centi is one hundred of your base unit.
This table is very helpful, because as you move across it you can simply shift the decimal left or right as you move toward the desired unit.
So, if you have 678,000 centimeters, you can move the decimal 5 places to the left; this is the same as moving across the table, or multiplying by 0.00001.
Your answer: 678,000 cm = 6.78 km
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There are 100 cm in a meter and 1,000 meters in a km. To convert km to cm, multiply by 100,000; 480 km equals 48,000,000cm.
Answer: 86,000 cm = 0.86 km
Answer: 2.75 km = 275,000 cm
1 cm equals 0.00001 km, therefore 2500 cm equals 0.025 km.
Multiply km by 100,000.