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21 decimeters = 2.1 meters

214 centimeters = 2.14 meters

2142 millimeters = 2.142 meters

If all these measurements were accurately taken, the millimeters would be most precise because it gives the most (hopefully correct) numbers after the decimal point when you compare everything in meters.

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Q: Which is more precise a 21 decimeter a 214 centimeter a 2 meter or a 2142 millimeter?
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