A dozen is very unusual.
No, the base for the metric system is ten.
Measuring Digits are TWELVE (inches) in the British System and HUNDRED (centimetres) in the Metric System
The standard form of twelve thousandths is 1.2 × 10-2
Because the metric system bases all of its units of measurements on powers of ten, it is much easier to perform mathematical calculations with the metric system than with the English system, which uses a variety of seemingly random ratios of one unit to the next. A mile is equal to 5,280 feet. A yard is three feet, a foot is twelve inches. And so forth. It makes for needlessly complicated calculations.
Twelve hundred-thousandths in standard form is 0.00012
Twelve hundredths in standard form is 1.2 × 10-1
Twelve and eleven hundredths in standard form is 1.211 × 101The standard notation would be 12.11
Twelve and sixteen hundredths (12.16) in standard form is 1.216 × 101
Two and twelve ten-thousandths in standard form is 2.0012
The standard form of twelve and fifty-four hundredths is 1.254 × 101
The most correct standard form for 12.12 is "twelve point one two." The form "twelve and twelve one-hundredths" is also correct but is not the standard form. The common form "twelve point twelve" may be used from time to time (even by math teachers) but is not a correct form.
twelve-tone system