The metric system is easy, as each major unit of measurement is bigger or smaller than each other by a number which will always be a 1 followed by a number of 0s. This makes it easier to remember the conversions. Here is a table that lists how much of one metric unit fits into another.

Note, the number in each box is based on how many of the unit in the left collumn, fit into the unit of the top row.

Metric Conversion
Calculating Area of Shapes
Calculating Perimeter