1 kilometer = 1,000 meters = 100,000 centimeters.
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Kilometers (km), meters (m), and centimeters (cm) are all units of length in the metric system. The relationship between them is based on the concept of conversion factors: 1 km is equal to 1000 m, and 1 m is equal to 100 cm. Therefore, to convert from kilometers to meters, you would multiply by 1000, and to convert from meters to centimeters, you would multiply by 100.
7 km = 7*1000 m = 7*1000*100 cm = 700000 cm
500 km = 500,000 m 500,000 m = 500,000,000 cm 2.54 cm = 1 in 500,000,000 cm / 2.54 = ~196,850,393.7 in
1000 cm = 1 m1000 m = 1 kmtherefore 1 km is much bigger than 1000 cm
3 dm, 3000 cm, 3000 m, 300 km
decimeter = dm centimeter = cm meter = m kilometer = km