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  2. List of Schoolhouse Rock! episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Schoolhouse_Rock...

    1. 1. "Three is a Magic Number". Bob Dorough. Bob Dorough. January 6, 1973. (1973-01-06) A magician shows how magic the multiplication of 3 really is, including a family of three and a football team whose uniforms are numbered in threes. "Three Is a Magic Number" was the pilot episode and had originally aired in full as part of Curiosity Shop ...

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Casting out nines. 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 ...

  4. List of Billboard Mainstream Rock number-one songs of the ...

    en.wikipedia.org/wiki/List_of_Billboard...

    The 1990s brought a new methodology of measuring airplay on the Billboard charts, and its impact was shown in the Album Rock Tracks chart. [1] Songs stayed on the chart for a long time and fewer songs made it on the chart. Ten songs had runs at number one of ten weeks or longer during the 1990s, with the longest coming from "Touch, Peel and ...

  5. Schoolhouse Rock! - Wikipedia

    en.wikipedia.org/wiki/Schoolhouse_Rock!

    The Schoolhouse Rock Songbook (Cherry Lane Music), containing sheet music for 10 songs. Schoolhouse Rock! Soundtrack The 4-CD release with bonus tracks on each CD was released on June 18, 1996, by Rhino Records. The Best of Schoolhouse Rock (ISBN 1-56826-927-7) was released in 1998 jointly by American Broadcasting Companies, Inc. and Rhino Records.

  6. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    In mathematics, 0.999... (also written as 0.9, 0.. 9, or 0. (9)) denotes the smallest number greater than every number in the sequence (0.9, 0.99, 0.999, ...). It can be proved that this number is 1; that is, Despite common misconceptions, 0.999... is not "almost exactly 1" or "very, very nearly but not quite 1"; rather, 0.999... and "1" are ...

  7. Schoolhouse Rock! (soundtrack) - Wikipedia

    en.wikipedia.org/wiki/Schoolhouse_Rock!_(soundtrack)

    Schoolhouse Rock! is a television soundtrack based on the animated television series Schoolhouse Rock!, released by Rhino Records on June 18, 1996, and contains 52 tracks. In 2018, the album was selected by the Library of Congress for preservation in the United States National Recording Registry for being "culturally, historically, or aesthetically significant".

  8. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    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.

  9. 9 - Wikipedia

    en.wikipedia.org/wiki/9

    Mathematics. 9 is the fourth composite number, and the first odd composite number. 9 is also a refactorable number. [2] Casting out nines is a quick way of testing the calculations of sums, differences, products, and quotients of integers in decimal, a method known as long ago as the 12th century. [3]

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