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  2. Josephus problem - Wikipedia

    en.wikipedia.org/wiki/Josephus_problem

    The Josephus problem is a mathematical problem related to a counting-out game where people are executed in a circle. Learn about its history, variants, generalizations and solutions from this Wikipedia article.

  3. Kaktovik numerals - Wikipedia

    en.wikipedia.org/wiki/Kaktovik_numerals

    30,561 10 3,G81 20 ÷ ÷ ÷ 61 10 31 20 = = = 501 10 151 20 30,561 10 ÷ 61 10 = 501 10 3,G81 20 ÷ 31 20 = 151 20 ÷ = (black) The divisor goes into the first two digits of the dividend one time, for a one in the quotient. (red) fits into the next two digits once (if rotated), so the next digit in the quotient is a rotated one (that is, a five). (blue) The last two digits are matched once for ...

  4. Skip counting - Wikipedia

    en.wikipedia.org/wiki/Skip_counting

    Skip counting is a math technique that involves counting by twos, threes, fours, etc. It is used to teach multiplication in reform math textbooks. Learn how to skip count and its applications.

  5. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    Chisanbop is a system of representing and calculating numbers with the hands, created in Korea and revised by Hang Young Pai. It can count up to 99 with each hand representing one or two digits, but it is not widely used for teaching math.

  6. Catalan number - Wikipedia

    en.wikipedia.org/wiki/Catalan_number

    Catalan numbers are a sequence of natural numbers that occur in various combinatorial problems, such as counting Dyck words, binary trees, lattice paths and polygon triangulations. They are named after Eugène Charles Catalan and have many formulas, recurrences and interpretations.

  7. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The Millennium Prize Problems are seven unsolved mathematical problems that the Clay Mathematics Institute offered US$ 1 million prizes for in 2000. The only solved problem is the Poincaré conjecture, while the others remain open despite many attempts and controversies.

  8. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    Tally marks are a form of numeral used for counting, often with notched sticks called tally sticks. Learn about the origins, variations, and writing systems of tally marks, and how they are encoded in Unicode.

  9. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    A numeral system is a writing system for expressing numbers using digits or other symbols in a consistent manner. Learn about the history, types and properties of different numeral systems, such as decimal, binary, Roman, unary and positional.

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