It usually looks like a number, followed by the units of measurement such as "1.78 metres" or "178 centimetres" or "5 foot 10 inches".
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That's about three glasses of water. Or a bottle of wine.
In measurement, 8mM is 8/10 of a centimeter, or 8/10 000 of a meter.
standard of weight and measurement
A map scale is a bar with the real measurement on the top, and the scale to the country on the bottom. I doubt this helps, but hey, maybe.
It looks like 3 cents - exactly as in the question! A decimal representation does not imply a change in the measurement units. If this is required then you need to specify the units into which the quantity is to be converted.