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I know that in some country, there is a term for numbers like

0.5, 9.15, 4.22

I mean number with dot(.) in its expression.

I sought for the term in English. It was

Decimal Number

But the term "decimal number" means just base-10 number.

3, 19, 277 

Above numbers are in base-10 form, so they are decimal number (even though they do not have dot(.))

Is there a exclusive term for numbers with (.) in its expression ?

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  • 1
    Decimal can also mean 'expressing part of a whole number as a decimal rather than a fraction' - 1.5 as opposed to 1 1/2. Oct 2, 2021 at 14:29
  • You seem to be looking for a classification that includes 3.14, 5.0, and 0.0 but excludes 5 and 0. In math, 5 and 5.0 represent the same number. In computer science, though, the former is represented by an integer and the latter by a float. There are some inherent difficulties with this kind of classification. So two questions: are we talking math or computer science? And does 5.0 count as a decimal number, or not count because it's also an integer?
    – rajah9
    Oct 2, 2021 at 14:40
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    @rajah9 - Along with floating point there is also fixed point
    – Jim
    Oct 2, 2021 at 14:46
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    @Jim and who could forget Binary Coded Decimal? Sheepishly raises hand
    – rajah9
    Oct 2, 2021 at 14:48
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    They are decimal fractions
    – Hot Licks
    Oct 2, 2021 at 16:41

2 Answers 2

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I'm pretty sure decimal fraction is the technical term.

Wikipedia: Decimal fractions
Wikipedia: Decimal fractions and percentages

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  • What about 5.0? That is a number with a decimal point but has no decimal fraction.
    – rajah9
    Oct 2, 2021 at 14:42
  • @rajah9 5·0 has more than one meaning. It may be just a whimsical way of representing 5 (or be being used to make a point, say) or it might be a rounded figure (a result correct to 1dp). Oct 2, 2021 at 15:06
  • @rajah9 to answer your question: OP hasn't yet indicated whether they want that in or out. In any case I'd argue it's a bit of an edge case.
    – loopy walt
    Oct 2, 2021 at 15:18
  • Is there a general term for decimal fractions, binary fractions, hexadecimal fractions etc.?
    – alephalpha
    Jan 30, 2023 at 10:22
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There is a term widely used in mathematics for a class of numbers that is not of the class that you seek to describe, which is a "integer", and the closely related concepts of "whole numbers" which include zero but exclude negative numbers, and of "counting numbers" which consist of whole numbers other than zero.

A non-integer real number would be close, but would include for example, 5 and 3/4 (which is a mixed fraction), as well as 5.75, so that would be somewhat broader than the word you are looking for in this case. Also, the word non-integer without the "real number" qualification can be taken to also include complex numbers (i.e. numbers that include the square root of -1), for example. And, non-integer is a word that would only be familiar to people with a fairly advanced high school level mathematics education that they have retained - it is a technical term rather than a vernacular term.

Sometimes the word decimal is used in isolation to mean what you say (e.g. "converting decimals to fractions"), although this word is rarely formally defined in that way in textbooks, it just gets used in this way. This is probably the best word to use to convey the meaning you intend.

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