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  2. Numberlink - Wikipedia

    en.wikipedia.org/wiki/Numberlink

    The lines cannot branch off or cross over each other, and the numbers have to fall at the end of each line (i.e., not in the middle). It is considered that a problem is well-designed only if it has a unique solution [1] and all the cells in the grid are filled, although some Numberlink designers do not stipulate this.

  3. Grid method multiplication - Wikipedia

    en.wikipedia.org/wiki/Grid_method_multiplication

    The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.

  4. Carmen Sandiego's ThinkQuick Challenge - Wikipedia

    en.wikipedia.org/wiki/Carmen_Sandiego's...

    In a review of a package entitled Adventure Workshop: 4th-6th Grade which featured the games The ClueFinders Reading Adventures Ages 9-12, Carmen Sandiego's ThinkQuick Challenge, and Super Solvers Mission: T.H.I.N.K., Hilary Williams of AllGame said that it is "one of those rare compilations where all of the included titles are superb", adding ...

  5. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    The task is then reduced to recursively computing these hash tables for increasing n, starting from n=1 and continuing up to e.g. n=4. The tables for n=1 and n=2 are special, because they contain primitive entries that are not the combination of other, smaller formulas, and hence they must be initialized properly, like so (for n=1 )

  6. Mathematical Kangaroo - Wikipedia

    en.wikipedia.org/wiki/Mathematical_Kangaroo

    In all participating countries the challenge is a multiple-choice test. Collecting results, marking, and awarding prizes are regulated and organized nationally. In most countries, the challenge runs for 50 up to 75 minutes. [13] It consists of 24 up to 30 problems. The sections for 3 point-, 4 point-, and 5 point-problems are equally divided.

  7. 24 (puzzle) - Wikipedia

    en.wikipedia.org/wiki/24_(puzzle)

    The original version of 24 is played with an ordinary deck of playing cards with all the face cards removed. The aces are taken to have the value 1 and the basic game proceeds by having 4 cards dealt and the first player that can achieve the number 24 exactly using only allowed operations (addition, subtraction, multiplication, division, and parentheses) wins the hand.

  8. Nonogram - Wikipedia

    en.wikipedia.org/wiki/Nonogram

    A completed nonogram of the letter "W" from the Wikipedia logo. Nonograms, also known as Hanjie, Paint by Numbers, Picross, Griddlers, and Pic-a-Pix, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the edges of the grid to reveal a hidden picture.

  9. Hundred-dollar, Hundred-digit Challenge problems - Wikipedia

    en.wikipedia.org/wiki/Hundred-dollar,_Hundred...

    The Hundred-dollar, Hundred-digit Challenge problems are 10 problems in numerical mathematics published in 2002 by Nick Trefethen . A $100 prize was offered to whoever produced the most accurate solutions, measured up to 10 significant digits. The deadline for the contest was May 20, 2002.