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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216. Similarly, by adding instead of subtracting, the same methods can be used to multiply by 11 and 12, respectively (although simpler methods to multiply by 11 exist).

  3. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    The method for general multiplication is a method to achieve multiplications with low space complexity, i.e. as few temporary results as possible to be kept in memory. This is achieved by noting that the final digit is completely determined by multiplying the last digit of the multiplicands. This is held as a temporary result.

  4. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    This example uses peasant multiplication to multiply 11 by 3 to arrive at a result of 33. Decimal: Binary: 11 3 1011 11 5 6 101 110 2 12 10 1100 1 24 1 11000 —— —————— 33 100001 Describing the steps explicitly: 11 and 3 are written at the top

  5. Blackstone's Card Trick Without Cards - Wikipedia

    en.wikipedia.org/wiki/Blackstone's_Card_Trick...

    Take the card's face value (with aces counting as 1 and royal cards counting as 11, 12 and 13 respectively) Double it. Add 3. Multiply by 5. If the card the spectator is thinking of is a spade, subtract 1. If the card the spectator is thinking of is a heart, subtract 2. If the card the spectator is thinking of is a club, subtract 3.

  6. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    11 0 (Take the last digit of the number, and check if it is 0 or 5) 11 0 (If it is 0, take the remaining digits, discarding the last) 11 × 2 = 22 (Multiply the result by 2) 110 ÷ 5 = 22 (The result is the same as the original number divided by 5) If the last digit is 5. 85 (The original number)

  7. 11 tricks for saving every time at Whole Foods

    www.aol.com/article/2016/05/24/11-tricks-for...

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  8. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 2 ⁠ 1 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠ Multiplication (often denoted by the cross symbol × , by the mid-line dot operator ⋅ , by juxtaposition, or, on computers, by an asterisk * ) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition ...

  9. Just Words: Tips and Tricks - AOL

    www.aol.com/news/2014-07-29-just-words-tips-and...

    her seemingly risky move for the simple reason that you miss the chance of scoring. In Just Words you want to constantly be proactive. Staring at tiles of little value wont help you win the game.