For distance, no. Day to day we use mm, cm, m and km. But in more specialised settings (e.g. construction) I’ve seen sometimes decameters.

For weight yes, grams, hectograms, kg, tons. Liquids is usually ml, cl, liters, hectoliters (not sure it’s spelt that way).

In labs I’ve also seen also micro and nano of all three units.

Valid, but rarely used, as it’s usually just as fast to say “two hundred meters” instead of “two hecto meters”.

However, those prefixes have other (non-SI) uses. A hectare is common way of referring to a 100x100 meter area. And a decare is 10 ares, i.e. 0.1 hectare.

In The Netherlands we actually use “hectometerpaaltjes”, which translates to hectometer-signs. They are numbered signs placed on regional roads and highways every 100 meters, which is a hectometer. Although not a direct use of measurement, the term hectometer still is in active use this way.

As an American who has gotten very used to metric units in studying engineering, the general rule I picked up is that you typically only change units every three orders of magnitude. So 8 decameters would typically be expressed as 80 meters, maybe 0.08 kilometers. Decameters and hectometers are a thing, but they’re not common units. Even centimeters don’t see much use compared to millimeters.

in school in austria we teach dezimeter (tenth of a meter)

From my experience in Norway, these are typical in context of daily speech:

Weight (gram): tonne (a substitute name for Mg (Mega)), kg, hg, g, mg, μg (mostly in medicine)

Distance (meter): mil (10 km), km, m, dm (kinda rare), cm, mm

Volume (liter): l, dl, cl, ml

In my experience, the deca-predix is very rarely used. Most of the missing prefixes are just substituted for numbers, i.e. saying “a thousand kilometers” is much more common that “a megameter”. Of course, this differs depending on context, as a lot of the prefixes become more common within scientific fields where the sizes are common.

On a separate note, even the numbers can be a bit inconsistent. It has bothered me that it’s often common to say “a thousand milliard” instead of “one billion” (also note that we use the long scale).

It depends on the situation, sometimes they are really handy but most of the time we stick to kilo, centi and mili.

Where i live, Hecto (100x) is used, for example to measure distances and areas for big properties. 1 hectometro equalls 100 m, or 1 hectarea (hm^2) equals 10000 m^2.

Also, it is widely use for pressure, cause 1 atm is 1013 hPa

Decameters are used but for special situations, like quantifying natural gas consumption

In Poland: decimeters are sometimes used (I have been ordering cut sheet metal priced by square decimeters) , I have not seen decameters in use. Hectopascales are often used in weather reports. Decagrams are often used when buying food where these amounts make most sense (meat, candy).

The ‘more exotic’ prefixes are usually only used with some specific SI units and in very specific contexts.

Yes, they are used, but typically in specialized applications which is why you don’t see them every day.

In America, I’ve seen nurses and diabetics use deciliters in reference to medication or concentration before.

In metric units, we primarily use the x1000 or x1/1000 steps, with a few notable exceptions. We use the centimeter (1cm = 1/100m) quite commonly, the centiliter (1cl = 1/100l) is also relatively common with drinks, and, IIRC, the Austrians use the deka, short for decagram (1dg = 10g).

We use litres, which is one decimetre cubed. We use hectares, which is one hectometre squared. But the beauty of it is, that you can just convert everything to units that are more widely understood.

• 1 decimetre = 10 centimetres = .1 metres

• 1 hectometre = 100 metres = .1 kilometre

These two specifically - I don’t think I’ve ever seen them.

Hectoliters are sometimes used e.g. for measuring beer consumption for an event, decimeters in some informal contexts, some country commonly describe drink sizes in centiliters or deciliters.

Centimeters are common, I’d say more common than millimeters in informal context.

I think hectare, decibel are few of them?

Sweden uses decimeters and deciliters