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300000000 (8 zeros) = 300,000,000 m = 3.0 x 108 m = 3.0 x 105 km
3.2 km (1000 meters/1 kilometer)(100 cm/1 m) = 320,000 centimeters ===================( can call it 3.2 X 105 centimeters )
1 km = 1,000 m 2 km = 2,000 m 3 km = 3,000 m . . . 51 km = 51,000 m 51.42 km = 51,420 m
1,000 m = 1 km 2,000 m = 2 km 3,000 m = 3 km 6,000 m = 6 km 9,000 m = 9 km.
1 km = 105 cm so 1 sq km = (105)2 = 1010 or 10 billion sq cm.