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The oldest known multiplication tables were used by the Babylonians about 4000 years ago. [2] However, they used a base of 60. [2] The oldest known tables using a base of 10 are the Chinese decimal multiplication table on bamboo strips dating to about 305 BC, during China's Warring States period. [2] "Table of Pythagoras" on Napier's bones [3]
For each positive integer , let () be the number of distinct integers in an multiplication table. In 1960, [ 5 ] Erdős studied the asymptotic behavior of M ( N ) {\displaystyle M(N)} and proved that
[2] [3] Thus, in the expression 1 + 2 × 3, the multiplication is performed before addition, and the expression has the value 1 + (2 × 3) = 7, and not (1 + 2) × 3 = 9. When exponents were introduced in the 16th and 17th centuries, they were given precedence over both addition and multiplication and placed as a superscript to the right of ...
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.
Mental division by multiples of 10 2: 22 "Hundredths and Thousandths" Ordering mixed sets of numbers 3: 23 "Make and Break: Part 1" Multiples and grid pattern multiplication 4: 24 "Make and Break: Part 2" Factors and prime numbers 5: 25 "Do Same to the Bottom as the Top" Equivalent fractions 6: 26 "More Fraction Action" Finding fractions 7: 27 ...
The History of Mathematical Tables: from Sumer to Spreadsheets is an edited volume in the history of mathematics on mathematical tables.It was edited by Martin Campbell-Kelly, Mary Croarken, Raymond Flood, and Eleanor Robson, developed out of the presentations at a conference on the subject organised in 2001 by the British Society for the History of Mathematics, [1] [2] and published in 2003 ...