Depends how long the ruler is obviously.
But if you are talking about a meter stick (very close in size to a yard-stick) then it is 100 cm.
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A metric ruler typically represents centimeters through a scale of 0 to 30 centimeters. Each centimeter is subdivided into smaller units (usually millimeters) for more precise measurements.
0.03125 = 1/32 inches.
On a ruler using the metric system, you would typically find units such as centimeters and millimeters. These units are used for measuring length and are based on powers of ten for easy conversion. The metric system is widely used in many countries around the world.
A normal school ruler is typically 30 centimeters in length, which is equivalent to 300 millimeters.
there are many instruments used to measure length depending upon the size of object , Ruler is Metric instrument used to measure length. Screw gauge is also used as an instrument used to measure length in mm.
30 centimeters