This cannot really be answered because there are no decimal places. You can say 3000 millimetres is 3 metres. So 3 metres is either 0.3 decametres or 0.003 kilometres. These are decimals, but you are changing the prefix in front of the metre.
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It is simply 3,000.0 as a decimal
3000 as a decimal is 3000.0. As a fraction, it's 3000/1. So unless you're feeling fancy and want to simplify that fraction, 3000 is just 3000. Hope that clears things up for you!
19.0 mm, or 0.019 metres, or 0.000019 kilometres?
One-fifth of 3000 can be calculated by dividing 3000 by 5. This results in 600, which is one-fifth of 3000. This can also be expressed as 3000 multiplied by 0.2, as 0.2 represents one-fifth in decimal form.
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 3000, exactly as in the question.