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  2. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    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. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

  3. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    For example: set the monkey's feet to 4 and 9, and get the product—36—in its hands. ... −1 times any number is equal to the additive inverse of that number: ...

  4. 36 (number) - Wikipedia

    en.wikipedia.org/wiki/36_(number)

    36 is the largest numeric base that some computer systems support because it exhausts the numerals, 0–9, and the letters, A-Z. See Base 36. The truncated cube and the truncated octahedron are Archimedean solids with 36 edges. [9] The number of domino tilings of a 4×4 checkerboard is 36. [10] Since it is possible to find sequences of 36 ...

  5. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    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, the effect is to "cast out" one more 9 to give the result 12.

  6. Power of 10 - Wikipedia

    en.wikipedia.org/wiki/Power_of_10

    The term was coined by 9-year-old Milton Sirotta, nephew of American mathematician Edward Kasner. It was popularized in Kasner's 1940 book Mathematics and the Imagination, where it was used to compare and illustrate very large numbers. Googolplex, a much larger power of ten (10 to the googol power, or 10 10 100), was also introduced in that book.

  7. Names of large numbers - Wikipedia

    en.wikipedia.org/wiki/Names_of_large_numbers

    The name of a number 10 3n+3, where n is greater than or equal to 1000, is formed by concatenating the names of the numbers of the form 10 3m+3, where m represents each group of comma-separated digits of n, with each but the last "-illion" trimmed to "-illi-", or, in the case of m = 0, either "-nilli-" or "-nillion". [17]

  8. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    The fourth triangular number equals the third tetrahedral number as the nth k-simplex number equals the kth n-simplex number due to the ... 36 = 9 × 4 45 = 9 × 5 55 ...

  9. 666 (number) - Wikipedia

    en.wikipedia.org/wiki/666_(number)

    Since 36 is also triangular, 666 is a doubly triangular number. [5] Also, 36 = 15 + 21 where 15 and 21 are triangular as well, whose squares ( 15 2 = 225 and 21 2 = 441 ) add to 666 and have a difference of 216 = 6 × 6 × 6 .