Use...
Kilo
Hecta
Deka
Base (grams, liters, meters)
Deci
Centi
Milli
When you are converting you start at which ever unit you are converting from and then find what unit you are converting to. Count how many spaces between that starting from the unit you are converting from. If you moved left, move the decimal in your number left how many times you moved. Do the same if you moved right. It's kind if confusing
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there are 100 cm in a km
100,000
If you mean kilometer, then it is 100000cm=1km
A kilometer (km) is much larger than a centimeter (cm). There are 100,000 cm in one km.
decimeter = dm centimeter = cm meter = m kilometer = km