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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 ...
Square One Television (sometimes referred to as Square One or Square One TV) is an American children's television program produced by the Children's Television Workshop (now known as Sesame Workshop) to teach mathematics and new abstract mathematical concepts to young viewers. Created and broadcast by PBS in the United States from January 26 ...
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.
Periscope, a live video streaming app for iOS and Android developed by Kayvon Beykpour and Joe Bernstein is launched (and acquired by Twitter before its launch). [48] 2015 May Companies Meerkat, a mobile app that enables users to broadcast live video streaming through their mobile device, releases its app for both iOS and Android. [49] 2016 January
The Karatsuba algorithm is a fast multiplication algorithm. It was discovered by Anatoly Karatsuba in 1960 and published in 1962. [1][2][3] It is a divide-and-conquer algorithm that reduces the multiplication of two n -digit numbers to three multiplications of n /2-digit numbers and, by repeating this reduction, to at most single-digit ...
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episodes. Cyberchase is an animated mathematics series that currently airs on PBS Kids. The show revolves around three Earth children (Jackie, Matt, and Inez) who use mathematics and problem-solving skills to save Cyberspace from a villain known as The Hacker. The three are transported into Cyberspace by Motherboard, the ruler of this virtual ...
Schoolhouse Rock! is an American interstitial programming series of animated musical educational short films (and later, music videos) which aired during the Saturday morning children's programming block on the U.S. television network ABC. The themes covered included grammar, science, economics, history, mathematics, and civics.