Thanks to the prefixes, the value of a quantity with its own unit, in the range from yocto to yotta, can always be expressed with a number between 1 and 1000. Millimeter - mm. While all metric prefixes in common use today are decadic, historically there have been a number of binary metric prefixes as well. By convention, the number is always shown as a unit [ 1 to 9 ], with decimal places chosen to suit accuracy, and the … Meter - m. Decimeter - dm. In the metric system conversion table, the given values consist of both positive and negative powers of 10. Title. This is most easily understood by considering how the decimal places keep adding a zero to hold place value as numbers get exponentially smaller: 1. Metric prefixes rarely appear with imperial or US units except in some special cases (e.g., microinch, kilofoot, kilopound). It's worth the effort to memorize these common metric system prefixes so that you understand basic units of measurement and how they are related, even if you don't use the metric system on a regular basis. For example, linking the prefix kilo- to the basic unit meter gives you the kilometer, which means 1,000 meters. The above mentioned introduction really explains it quite nicely. The basic units of these measurements for the metric system are listed in the chart below. The metric system is a base 10 system. Metric or SI (Le Système International d'Unités) units are based on units of ten.Very large or very small numbers are easier to work with when you can replace any scientific notation with a name or word. The names of metric units are formed by adding a prefix to the basic unit of measurement. null. As a prefix, yocto was adopted by the XIX General Conference on Weights and Measures in 1991. In total there are twenty prefixes that have been officially adopted to be used with the various units of measure. Prefixes create multiples and parts of the basic units and this makes measusrement of all sorts easier. The metric system charts in this ScienceStruck post will help kids understand converted values quite easily.