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3 down extreme – Numbers 1–3 are pre-dropped, leaving numbers 4–9 up. Lucky number 7 – The only number up is 7, and the first person to roll a 7 wins. Unlucky number 7 – A standard game, when a 7 is rolled, the game stops. Against all odds – All odd numbers are up and evens down. Even Stevens – All even numbers are up and odds down.
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 ...
The smallest (and unique up to rotation and reflection) non-trivial case of a magic square, order 3. In mathematics, especially historical and recreational mathematics, a square array of numbers, usually positive integers, is called a magic square if the sums of the numbers in each row, each column, and both main diagonals are the same.
Learning Resources Sum Swamp Game. Price: $20 from Amazon. Buy It. This award-winning math game for the early-elementary set reinforces basic addition and subtraction as kids race their critters ...
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 ...
Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...
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