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  2. Karatsuba algorithm - Wikipedia

    en.wikipedia.org/wiki/Karatsuba_algorithm

    Karatsuba's basic step works for any base B and any m, but the recursive algorithm is most efficient when m is equal to n/2, rounded up. In particular, if n is 2 k, for some integer k, and the recursion stops only when n is 1, then the number of single-digit multiplications is 3 k, which is n c where c = log 2 3.

  3. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.

  4. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    If the tens digit is odd, the ones digit must be 2 or 6. 40,832: 3 is odd, and the last digit is 2. The sum of the ones digit and double the tens digit is divisible by 4. 40,832: 2 × 3 + 2 = 8, which is divisible by 4. 5: The last digit is 0 or 5. [2] [3] 495: the last digit is 5. 6: It is divisible by 2 and by 3. [6]

  5. Basic Math (video game) - Wikipedia

    en.wikipedia.org/wiki/Basic_Math_(video_game)

    The right difficulty switch functions on whether or not there will be a timer in the game. The left difficulty switch changes whether the player has 12 or 24 seconds in the first four game modes. In the other four game modes, the player has either two-digit problems with a 24 second time limit or single digit problems with a 12 second time ...

  6. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    An easy task for the beginner is extracting cube roots from the cubes of 2-digit numbers. For example, given 74088, determine what two-digit number, when multiplied by itself once and then multiplied by the number again, yields 74088. One who knows the method will quickly know the answer is 42, as 42 3 = 74088.

  7. Mastermind (board game) - Wikipedia

    en.wikipedia.org/wiki/Mastermind_(board_game)

    key pegs, some colored red (or black) and some white, which are flat-headed and smaller than the code pegs; they will be placed in the small holes on the board. The two players decide in advance how many games they will play, which must be an even number. One player becomes the codemaker, the other the codebreaker.

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Instant Insanity - Wikipedia

    en.wikipedia.org/wiki/Instant_Insanity

    Mapping the edges of the two directed subgraphs to the left (L) and right (R), and front (F) and back (B) faces solves the puzzle. The upper subgraph lets one derive the left and the right face colors of the corresponding cube. E.g.: The solid arrow from Red to Green says that the first cube will have Red in the left face and Green at the Right.

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