The metric system is based on the number 10.
http://wiki.answers.com/Q/What_number_is_the_metri...

The metric system is based in powers of ten, as every unit is ten times
http://www.chacha.com/question/whatnumberisthe...

The metric system is all units of tens. But, it is based on measurement of the earth, originally. The meter was a fraction of the circumference of the earth. Today it is based on
http://answers.yahoo.com/question/index?qid=200908...
