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There are 1,000,000 microns ion a metre. There are 1000mm in a metre. Therefore, there are 1,000,000/1000 microns in a mm, i.e. 1000microns in a millimetre.
Yes, there are quite a few units smaller than the millimetre. A micron is 1/1000th of mm. A nano metre is 1 millionth of a millimetre. A picometre is 1 billionth of a millimetre. See femto and attometre and also angstrom for further things smaller than a metre.
1 millimetre =0.001 metres Therefore, a millimetre is smaller than a metre.
A millimetre (mm) is 1/1000 of a metre (m). So 1 metre is 1000 millimetres. So 0.3 * 1 metre is 0.3 * 1000 millimetres. So 0.3 metres is 300 millimetres.
1/5 millimetre is one five thousandths of a metre.