Abacus

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Devices
Sand table
Abacus
Talk:Abacus
Salamis Tablet
Talk:Salamis Tablet
Roman abacus
Talk:Roman abacus
Counting rods
Talk:Counting rods
Rod calculus
Talk:Rod calculus
Suanpan
Talk:Suanpan
Chinese Zhusuan
Talk:Chinese Zhusuan
Soroban
Talk:Soroban
Etruscan numerals
Roman numerals
Talk:Roman numerals
Roman arithmetic
Bi-quinary coded decimal
Napier's bones
Talk:Napier's bones
Genaille–Lucas rulers
Slide rule
E6B
Talk:E6B
Algorithms
Subtractive notation
Methods of computing square roots
Talk:Methods of computing square roots
Square root of 2
Talk:Square root of 2
CORDIC
Talk:CORDIC