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  2. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    The triangular number T n solves the handshake problem of counting the number of handshakes if each person in a room with n + 1 people shakes hands once with each person. In other words, the solution to the handshake problem of n people is T n−1. [15]

  3. Kindergarten - Wikipedia

    en.wikipedia.org/wiki/Kindergarten

    The first free kindergarten in the US was founded in 1870 by Conrad Poppenhusen, a German industrialist and philanthropist, who also established the Poppenhusen Institute. The first publicly financed kindergarten in the US was established in St. Louis in 1873 by Susan Blow.

  4. Counting - Wikipedia

    en.wikipedia.org/wiki/Counting

    Number blocks, which can be used for counting. Counting is the process of determining the number of elements of a finite set of objects; that is, determining the size of a set. . The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the ...

  5. Mathcounts - Wikipedia

    en.wikipedia.org/wiki/Mathcounts

    The Math Video Challenge program allowed students in teams of 4 to create a video that explained the solution to a problem from the Mathcounts School Handbook in a real-world scenario. The program was discontinued in 2023, but a similar video project opportunity is offered through the National Math Club.

  6. Education in Chile - Wikipedia

    en.wikipedia.org/wiki/Education_in_Chile

    Segundo Nivel de Transición or Kinder: children between five and six years of age; The law establishes free access to the last two levels of pre-school. [4] A constitutional reform in 2013 called for the law to extend free access to four levels, and make the last one mandatory and a prerequisite to enter primary school. [5]

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