What is the term for all numbers except the natural numbers?

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There is no specific term for all numbers except natural numbers, with one humorous suggestion being "unnatural numbers." A math website noted that the closest alternative might be negative numbers. The discussion points out that if referring to all real numbers excluding natural numbers, it could be denoted as ##\mathbb{R} \setminus \mathbb{N}##. Additionally, the term "number" in mathematics is considered a colloquialism that encompasses various unrelated concepts. Overall, the conversation highlights the lack of a formal classification for this group of numbers.
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Is there a term used to describe all number except the natural numbers?
 
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Do you mean all real numbers except for the naturals? I suppose you'd denote it by ##\mathbb{R} \setminus \mathbb{N}##.

There's really no notion of "all numbers" in mathematics, since "number" is mostly a colloquialism used to describe all kinds of unrelated things.
 

Thread 'Area of Overlapping Squares'

Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?
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