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

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

    The total package for Grade 5 is listed at $1,388.42, and within that total the cost of the just mentioned student materials, for a class of 32, is $817.00 [11] Many mathematics classrooms where active learning occurs already own many of these materials, so it is not necessary to purchase all of these items from the publisher.

  3. Quincunx - Wikipedia

    en.wikipedia.org/wiki/Quincunx

    A quincunx (/ ˈ k w ɪ n. k ʌ ŋ k s / KWIN-kunks) is a geometric pattern consisting of five points arranged in a cross, with four of them forming a square or rectangle and a fifth at its center. [1] The same pattern has other names, including "in saltire" or "in cross" in heraldry (depending on the orientation of the outer square), the five ...

  4. Pentagonal number - Wikipedia

    en.wikipedia.org/wiki/Pentagonal_number

    The nth pentagonal number p n is the number of distinct dots in a pattern of dots consisting of the outlines of regular pentagons with sides up to n dots, when the pentagons are overlaid so that they share one vertex. For instance, the third one is formed from outlines comprising 1, 5 and 10 dots, but the 1, and 3 of the 5, coincide with 3 of ...

  5. Centered pentagonal number - Wikipedia

    en.wikipedia.org/wiki/Centered_pentagonal_number

    The parity of centered pentagonal numbers follows the pattern odd-even-even-odd, and in base 10 the units follow the pattern 1-6-6-1. Centered pentagonal numbers follow the following recurrence relations:

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The apparent plural form in English goes back to the Latin neuter plural mathematica , based on the Greek plural ta mathēmatiká (τὰ μαθηματικά) and means roughly "all things mathematical", although it is plausible that English borrowed only the adjective mathematic(al) and formed the noun mathematics anew, after the pattern of ...

  7. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    For example, the third triangular number is (3 × 2 =) 6, the seventh is (7 × 4 =) 28, the 31st is (31 × 16 =) 496, and the 127th is (127 × 64 =) 8128. The final digit of a triangular number is 0, 1, 3, 5, 6, or 8, and thus such numbers never end in 2, 4, 7, or 9. A final 3 must be preceded by a 0 or 5; a final 8 must be preceded by a 2 or 7.