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=={{anchor|10-Key}}Ten key notation==
[[File:Sharp EL-1192D Calculator.jpg|thumb|This printing calculator made by Sharp uses ten-key notation. Notice the size and placement of the keys, including the extra-large "+/=" and the red "-/=" keys.]]
{{see|Keypad}}
The '''ten-key notation''' input method first became popular with accountants' [[adding machine|paper tape adding machines]]. It generally makes the assumption that entered numbers are being summed, although other operations are supported. Each number entered is followed by its sign (+/−), and a running total is kept. An assumption is made that the last operand can be implicitly used next, so by just entering another + (for example), one will reuse the most recent operand. Ten key input mode is available in printing calculators from companies such as [[Sharp Corporation|Sharp]],<ref>{{cite web |url=http://siica.sharpusa.net/Business-Products/Calculators |title=SIICA.sharpusa.com > Resources > More Products > Calculators |website=siica.sharpusa.net}}</ref> and in software calculators like Judy's TenKey<ref>{{cite web |url=https://www.judysapps.com/TenKey.htm |title=Award-Winning Judy's TenKey Accounting Calculator for Windows |website=www.judysapps.com}}</ref> used by accounting firms. Online tenkey training and certification tools are available as well,<ref>{{cite web |url=https://www.learn2type.com/typingtest/tenkeycertificate.cfm |title=Ten Key Certificate on Learn2Type.com! |website=Learn2Type.com}}</ref><ref>{{cite web |url=http://www.abbyinc.com/abbyinc/KeyPro.asp |title=None |access-date=16 June 2023}}</ref> and some businesses use [[words per minute#Numeric entry|ten key typing speed]] as an employment criterion.
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