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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]
The New York Times Games (NYT Games) is a collection of casual print and online games published by The New York Times, an American newspaper. Originating with the newspaper's crossword puzzle in 1942, NYT Games was officially established on August 21, 2014, with the addition of the Mini Crossword. [1] Most puzzles of The New York Times Games ...
In the example movement above, Tables 1, 2, 7, and 8 would use one set of boards, with boards entering at Table 2 and exiting at Table 7, and Tables 3, 4, 5, and 6 would use the other, with boards entering at Table 6 and exiting at Table 3. The remaining boards of each set usually are placed on stands next to the table where they will enter.
To "cast out nines" from a single number, its decimal digits can be simply added together to obtain its so-called digit sum. The digit sum of 2946, for example is 2 + 9 + 4 + 6 = 21. Since 21 = 2946 − 325 × 9, the effect of taking the digit sum of 2946 is to "cast out" 325 lots of 9 from it. If the digit 9 is ignored when summing the digits ...
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Vedic square. In Indian mathematics, a Vedic square is a variation on a typical 9 × 9 multiplication table where the entry in each cell is the digital root of the product of the column and row headings i.e. the remainder when the product of the row and column headings is divided by 9 (with remainder 0 represented by 9).
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