The kilo- prefix means 1,000
The milli- prefix means 1/1000
→ 1 mm = 1/1000 m
→ 1,000 mm = 1 m
1 km = 1,000 m = 1,000 × 1,000 mm = 1,000,000 mm
→ ½ km = 0.5 × 1,000,000 mm = 500,000 mm
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There are 500 meters in a half kilometer; a kilometer is 1,000 meters.
Oh, dude, 1 kilometer is like 1,000 meters, right? And then a meter is like 1,000 millimeters. So, like, 1 kilometer is 1,000,000 millimeters. That's a whole lot of millimeters, man.
6 kilometers = 6,000 meters (1 kilometer = 1,000 meters)3,000 millimeters = 3 meters (1 meter = 1,000 millimeters)6,000 meters + 3 meters = 6,003 meters
500
1 sq km = 1,000,000,000,000 sq mm