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2. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   In advanced mathematics, the number line is usually called the real line or real number line, and is a geometric line isomorphic to the set of real numbers, with which it is often conflated; both the real numbers and the real line are commonly denoted R or ⁠ ⁠. The real line is a one- dimensional real coordinate space, so is sometimes ...

3. File:Number line with numbers -3 to 3.svg - Wikipedia

   en.wikipedia.org/wiki/File:Number_line_with...

   Addition on the number line with the example (-2)+3=1. Addition on the number line with the example 1+2=3. SVG development . The SVG code is . This ...

4. Ruled paper - Wikipedia

   en.wikipedia.org/wiki/Ruled_paper

   Initially, paper was ruled by hand, sometimes using templates. [1] Scribes could rule their paper using a "hard point," a sharp implement which left embossed lines on the paper without any ink or color, [2] or could use "metal point," an implement which left colored marks on the paper, much like a graphite pencil, though various other metals were used.

5. File:Number-line.svg - Wikipedia

   en.wikipedia.org/wiki/File:Number-line.svg

   File:Number-line.svg. Size of this PNG preview of this SVG file: 750 × 50 pixels. Other resolutions: 320 × 21 pixels | 640 × 43 pixels | 1,024 × 68 pixels | 1,280 × 85 pixels | 2,560 × 171 pixels. Original file ‎ (SVG file, nominally 750 × 50 pixels, file size: 2 KB) This is a file from the Wikimedia Commons.

6. Extended real number line - Wikipedia

   en.wikipedia.org/wiki/Extended_real_number_line

   Extended real number line. In mathematics, the extended real number system[a] is obtained from the real number system by adding two elements denoted and [b] that are respectively greater and lower than every real number. This allows for treating the potential infinities of infinitely increasing sequences and infinitely decreasing series as ...

7. Numeral system - Wikipedia

   en.wikipedia.org/wiki/Numeral_system

   A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent different numbers in different numeral systems. For example, "11" represents the number eleven in the decimal or ...