Convert to the same units then a comparison can be made:
The kilo- prefix means 1000 → 1 km = 1000 m
The centi- prefix means 1/100 → 1 cm = 1/100 m
→ 6 km = 6 × 1000 m = 6000 m
→ 600 cm = 600 × 1/100 m = 6 m
6000 > 6
→ 6000 m > 6 m
→ 6 km > 600 cm.
6 km are greater than 600 cm.
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