The Angstrom is 10-8 cm, but I don't think this is a recommended SI unit. It would be called 100 picometers instead. (1 picometer = 10-12 meters)
One hundred-millionth of a centimetre is one millionth of a meter called a micrometer and written with the Greek *mju* character: µ
A tenth of a nanometre.
So 10000 times less than a cm is a micrometre, more commonly referred to as a micron
One hundred-millionth.
Nothing
A millimetere os one tenth of a centimetre so 160mm is 16cm. the reason it is milli-metre is because 'milli' is one millionth so it is one millionth of a metre thus forming millimetre a centimetre is one one hundredth of a metre 'centi' being the word of a hundredth
A second! 1 = Ten tenths = Hundred hundredths = Thousand thousandths etc. A millionth of a millionth of a second, or 1/(1million x 1 million) seconds, is called a picosecond. 1/(1 million) seconds, or one millionth of a second, is called a microsecond. 1/(1000 x 1million) seconds, or one thousandth of a microsecond, is called a nanosecond.
The first one, one hundred millionth, is 1/100,000,000 -- 1 out of 100 million. One hundred millionths is 100/1,000,000 -- 100 out of 1,000,000. It simplifies to 1/10,000.
15,485,863 (fifteen million four hundred eighty five thousand eight hundred sixty three) is the one millionth prime number.
One millionth of one million is equal to 1.
pi*10-8
e*10-8