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Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves the same remainder as ...
Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Ukrainian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...
Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result. For example, 9 × 27 = 270 − 27 = 243. 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.
Despite the concept of trick-or-treating originating in Britain and Ireland in the form of souling and guising, the use of the term "trick or treat" at the doors of homeowners was not common until the 1980s, with its popularisation in part through the release of the film E.T. [64] Guising requires those going door-to-door to perform a song or ...
According to the National Confectioners Association, consumers are to buy at least $6.5 billion in confectionery treats for the holiday. But a scary statistic for trick-or-treaters – more than ...
Mathematical joke. A mathematical joke is a form of humor which relies on aspects of mathematics or a stereotype of mathematicians. The humor may come from a pun, or from a double meaning of a mathematical term, or from a lay person's misunderstanding of a mathematical concept. Mathematician and author John Allen Paulos in his book Mathematics ...
The good news: Having a kid on Halloween means easy access to the spoils of trick-or-treating and the power to dress them up in the most adorable pumpkin costume you can possibly find (for a year ...
A multiplication algorithm is an algorithm (or method) to multiply two numbers. Depending on the size of the numbers, different algorithms are more efficient than others. Numerous algorithms are known and there has been much research into the topic. The oldest and simplest method, known since antiquity as long multiplication or grade-school ...