1 km = 1000 m,
1 m = 1000 mm,
Thus,
5.8 mm = 0.0058 m
and
0.0058 m = .0000058 km
Therefore,
5.8 mm = .0000058 km
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The metric system is not needed here. Just lay the bracelet flat and measure it with a fuler or measuring tape.
2.56 km + 8420 m = 22.56 km + 8.42 km = 30.98 km
4 km + 350 km = 354 km = 350,000 metres
the k means a thousand of them, so a km is 1000 meters and it is bigger.