The decimal system was and still is based on representing numbers in such a way that the place value of each digit is ten times that of the digit to its right. If it does not contain a fractional part then the decimal representation does not require a decimal point.
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Any real number can be expressed in the decimal system. However, since it is not possible to write out non-repeating infinite decimals, irrational numbers can only be approximated.
0.006 is a decimal since contains a decimal point
Since 0.3 is already expressed as a decimal, there is no equivalent decimal form.
Since 6.10 is already in decimal form, the answer is 6.10!
Since 63 is an integer, it is already in decimal form.