use the metric conversion ladder
kilo 1,000 units
hecto 100 units
deca 10 units
base unit 1 unit
deci .1 units
centi .01 units
milli .001 units
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To add and subtract with the metric system, make sure the units of measurement are the same (e.g. grams with grams, meters with meters). Then, simply add or subtract the numerical values. If needed, convert between different metric units before performing the operation.
THE METRIC SYSTEM WONDERLAND or THE WONDERS OF THE METRIC SYSTEM
in the metric system's hospital
The bubble in the metric system is called the millibubble.
The MEtric System was founded in 1670.
660 metres is in the metric system.