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2. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table from 1 to 10 drawn to scale with the upper-right half labeled with prime factorisations. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system.

3. Duodecimal - Wikipedia

   en.wikipedia.org/wiki/Duodecimal

   The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

4. Babylonian mathematics - Wikipedia

   en.wikipedia.org/wiki/Babylonian_mathematics

   The Babylonians used pre-calculated tables to assist with arithmetic. ... to simplify multiplication. ... This yields an annual interest rate of 12/60 = 20%, and ...

5. Cayley table - Wikipedia

   en.wikipedia.org/wiki/Cayley_table

   The group {1, −1} above and the cyclic group of order 3 under ordinary multiplication are both examples of abelian groups, and inspection of the symmetry of their Cayley tables verifies this. In contrast, the smallest non-abelian group, the dihedral group of order 6, does not have a symmetric Cayley table.

6. Mathematical table - Wikipedia

   en.wikipedia.org/wiki/Mathematical_table

   The first tables of trigonometric functions known to be made were by Hipparchus (c.190 – c.120 BCE) and Menelaus (c.70–140 CE), but both have been lost. Along with the surviving table of Ptolemy (c. 90 – c.168 CE), they were all tables of chords and not of half-chords, that is, the sine function. [1]

7. Napier's bones - Wikipedia

   en.wikipedia.org/wiki/Napier's_bones

   If the tables are held on single-sided rods, 40 rods are needed in order to multiply 4-digit numbers – since numbers may have repeated digits, four copies of the multiplication table for each of the digits 0 to 9 are needed. If square rods are used, the 40 multiplication tables can be inscribed on 10 rods.