In the metric system, the prefix that means 1000 is kilo-. Another prefix f is milli- and, it stands for thousandth. Prefixes are useful in converting between two quantities. For example, you can easily convert between kilometers and meters.
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1 over 1000 in the metric system is equal to 0.001. This is because the prefix "milli-" signifies one thousandth of a unit.
The prefix for million is mega-.
The prefix that equals 1 trillion in the metric system is tera-.
The prefix that represents hundredths in the metric system is "centi-."
In the metric system prefix milli means 1/1000 (thousedndth) of something - in this case grams, thus there are 1000 milligrams in a gram