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What are some of the most important things to know about the metric system?
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Some of the most important things to know about the metric system include: 
1. It is based on a decimal system, meaning that every unit has 10 factors and multiples (such as centimeters, meters, grams).
2. All units are based on powers of 10, so there are no fractions or decimals.
3. The metric system is used in more than 190 countries around the world.
4. Metric measurements are often abbreviated using the International System of Units (SI) prefixes.
5. There are three basic types of measurement systems – linear, area, and volume.
6. In the United States, the metric system is not mandatory for everyday use, but it is accepted by many people.