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  2. Investigations in Numbers, Data, and Space - Wikipedia

    en.wikipedia.org/wiki/Investigations_in_Numbers...

    In the original edition, there was no multiplication table presented. Instead, students were instructed to color-code multiples of numbers on a 100s chart and evaluate these charts to find common multiples and patterns. There is no formal presentation of decimal addition. Students are instructed to begin by using colored pencils on 10,000 grid ...

  3. Grid method multiplication - Wikipedia

    en.wikipedia.org/wiki/Grid_method_multiplication

    The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.

  4. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Placard outside a shop in Bordeaux advertising subtraction of 20% from the price of the second perfume purchased. Subtraction (which is signified by the minus sign −) is one of the four arithmetic operations along with addition, multiplication and division. Subtraction is an operation that represents removal of objects from a collection. [1]

  5. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    The digital root of the result of this calculation is then compared with that of the result of the original calculation. If no mistake has been made in the calculations, these two digital roots must be the same. Examples in which casting-out-nines has been used to check addition, subtraction, multiplication, and division are given below.

  6. Washington Wizards tie franchise record with 16th straight ...

    www.aol.com/washington-wizards-tie-franchise...

    It was their second consecutive win against the Hawks, having won in Atlanta two nights before. The Wizards are 2-2 when shooting over 40% from deep this season. There may be hope yet.

  7. Charles K. Gifford - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/charles-k-gifford

    From January 2008 to December 2012, if you bought shares in companies when Charles K. Gifford joined the board, and sold them when he left, you would have a -72.0 percent return on your investment, compared to a -2.8 percent return from the S&P 500.

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