One meter equals 100 centimeters, to convert 21 meters to centimeters we have to multiply the amount of meters by 100 to obtain the width, height or length in centimeters. 21 meters are equal to 21 x 100 = 2100 centimeters.
The meter (symbol: m) is the fundamental unit of length in the International System of Units (SI). It is defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." In 1799, France start using the metric system, and that is the first country using the metric.
The centimeter (symbol: cm) is a unit of length in the metric system. It is also the base unit in the centimeter-gram-second system of units. The centimeter practical unit of length for many everyday measurements. A centimeter is equal to 0.01 (or 1E-2) meter.
To calculate a meter value to the corresponding value in centimeters, just multiply the quantity in meters by 100 (the conversion factor).
centimeters = meters * 100
The factor 100 is the result from the division 1 / 0.01 (centimeter definition). Therefore, another way would be:
centimeters = meters / 0.01
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