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You're going to be writing a small length in terms of a really long one. That means the answer is going to be really small. You've chosen to express 5 mm in km, and that's 5 millimeters or 5 thousandths of a meter in terms of kilometers or thousands of meters. To convert millimeters to meters, you'll have to divide by 1,000. And to convert meters to kilometers, you'll have to divide by 1,000. So to convert millimeters to kilometers, you'll have to divide by 1,000,000 (a million), or 106. 5 mm / 106 = 5 x 10-6 kilometers, or 0.000005 kilometers.

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15y ago
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12y ago

5mm = (5 / (1 000 * 1 000)) = 0.000005 km

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12y ago

1 km = 1000m. All you have to do is to divide 5m by 1000: 5m/1000 = 0.005 km

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9y ago

5 mm is 0.000005km

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Q: What does 5mm represent in km?
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