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The basic unit of length (on a ruler) is the meter, symbol m.

Two smaller units (decimal fractions of the meter are:

centimeter cm (0.01 of the meter)

millimeter mm (0.001 of the meter)

The meter is slightly larger than a yard. Approximately 39.37 inches.

Conversely one inch is 2.54 centimeters exactly.

There are several other prefixes the multiply or divide SI units in powers of 10.

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Q: What are the most common SI units for a ruler?
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