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  2. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Mathematical explanation of the Twenty-one card trick with 27 cards: In each step, the cards are dealt into three piles. The piles are accumulated with the pile containing the target card (shaded yellow and labelled with the step number) put in the middle. After three steps, the middle card (*) is the one in all chosen piles.

  3. iCivics - Wikipedia

    en.wikipedia.org/wiki/ICivics

    iCivics, Inc. (formerly Our Courts) is a 501(c)(3) non-profit organization in the United States that provides educational online games and lesson plans to promote civics education and encourage students to become active citizens.

  4. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.

  5. Minimal counterexample - Wikipedia

    en.wikipedia.org/wiki/Minimal_counterexample

    The minimal counterexample method has been much used in the classification of finite simple groups.The Feit–Thompson theorem, that finite simple groups that are not cyclic groups have even order, was proved based on the hypothesis of some, and therefore some minimal, simple group G of odd order.

  6. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Add 5 + 9 = 14 so 4 is placed on the left side of the result and carry the 1. result: 49; Similarly add 7 + 5 = 12, then add the carried 1 to get 13. Place 3 to the result and carry the 1. result: 349; Add the carried 1 to the highest valued digit in the multiplier, 7 + 1 = 8, and copy to the result to finish. Final product of 759 × 11: 8349

  7. 64 Times Guys Mansplained Various Topics While Women Just ...

    www.aol.com/lifestyle/64-times-guys-mansplained...

    Image credits: anon #8. I always had really painful, irregular periods. Was diagnosed with PCOS at 14, and had to fight for an endometriosis diagnosis for a decade.

  8. Magic circle (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Magic_circle_(mathematics)

    Andrews's sphere with numbers 1 to 62 arranged along intersections of 5 circles of latitude (grey) and 6 circles of longitude (coloured) In 1917, W. S. Andrews published an arrangement of numbers 1, 2, 3, and 62 in eleven circles of twelve numbers each on a sphere representing the parallels and meridians of the Earth, such that each circle has ...

  9. Mathematical joke - Wikipedia

    en.wikipedia.org/wiki/Mathematical_joke

    The first part of this joke relies on the fact that the primitive (formed when finding the antiderivative) of the function 1/x is log().The second part is then based on the fact that the antiderivative is actually a class of functions, requiring the inclusion of a constant of integration, usually denoted as C—something which calculus students may forget.

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