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2. Decimal - Wikipedia

   en.wikipedia.org/wiki/Decimal

   Place value of number in decimal system. The decimal numeral system (also called the base-ten positional numeral system and denary / ˈ d iː n ər i / [1] or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers (decimal fractions) of the Hindu–Arabic numeral system.

3. File:Genaille-Lucas rulers full.pdf - Wikipedia

   en.wikipedia.org/wiki/File:Genaille-Lucas_rulers...

   Original file (2,689 × 2,308 pixels, file size: 167 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

4. Graduation (scale) - Wikipedia

   en.wikipedia.org/wiki/Graduation_(scale)

   A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.

5. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   The order of the natural numbers shown on the number line. A number line is a picture of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

6. images.huffingtonpost.com

   images.huffingtonpost.com/2009-03-19-cheatsheet.pdf

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7. Genaille–Lucas rulers - Wikipedia

   en.wikipedia.org/wiki/Genaille–Lucas_rulers

   Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones . By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations .