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  2. Square number - Wikipedia

    en.wikipedia.org/wiki/Square_number

    Square number. Square number 16 as sum of gnomons. In mathematics, a square number or perfect square is an integer that is the square of an integer; [ 1 ] in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals 32 and can be written as 3 × 3.

  3. List of children's games - Wikipedia

    en.wikipedia.org/wiki/List_of_children's_games

    This is a list of games that are played by children.Traditional children's games do not include commercial products such as board games but do include games which require props such as hopscotch or marbles (toys go in List of toys unless the toys are used in multiple games or the single game played is named after the toy; thus "jump rope" is a game, while "Jacob's ladder" is a toy).

  4. Paper fortune teller - Wikipedia

    en.wikipedia.org/wiki/Paper_fortune_teller

    Paper fortune teller. A fortune teller is a form of origami used in children's games. Parts of the fortune teller are labelled with colors or numbers that serve as options for a player to choose from, and on the inside are eight flaps, each concealing a message. The person operating the fortune teller manipulates the device based on the choices ...

  5. Square One Television - Wikipedia

    en.wikipedia.org/wiki/Square_One_Television

    November 6, 1992. (1992-11-06) Square One Television (sometimes referred to as Square One or Square One TV) was 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 ...

  6. Centered polygonal number - Wikipedia

    en.wikipedia.org/wiki/Centered_polygonal_number

    The difference of the n-th and the (n+1)-th consecutive centered k-gonal numbers is k(2n+1). The n-th centered k-gonal number is equal to the n-th regular k-gonal number plus (n-1) 2. Just as is the case with regular polygonal numbers, the first centered k-gonal number is 1. Thus, for any k, 1 is both k-gonal and centered k-gonal.

  7. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    This method requires the memorization of squares from 1 to 24. The square of n (most easily calculated when n is between 26 and 74 inclusive) is (50 − n) 2 + 100(n − 25) In other words, the square of a number is the square of its difference from fifty added to one hundred times the difference of the number and twenty five. For example, to ...