There might be a question or two that evaluate your understanding of the metric system on the GED math test. Below is an overview of some of the most common metric units
100 centimeter (cm) = 1 meter (m)
One meter is a little bit longer than a yard.
1,000 meters = 1 kilometer (km)
One mile is about as long as 1.5 kilometers.
1,000 gram (g) = 1 kilogram (kg)
One kilogram is a little heavier than 2 pounds.
One liter (L) is a little bigger than a quart, so a 2 liter bottle of soda is a little more than 2 quarts.
You might notice that when converting units within the metric system, it’s always by 10s, 100s, 1,000s etc. The units often begin with the same prefix as well, which signifies the size of the unit. For example kilo in both kilogram and kilometer. The table below lists those prefixes with the amounts they signify in relation with the base unit.
In the metric system all you need to do to convert to a unit one level smaller is move the decimal one space to the left, and to convert to a unit one level larger move the decimal one space to the right.