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  2. 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 ...

  3. Number bond - Wikipedia

    en.wikipedia.org/wiki/Number_bond

    Number bonds are often learned in sets for which the sum is a common round number such as 10 or 20. Having acquired some familiar number bonds, children should also soon learn how to use them to develop strategies to complete more complicated sums, for example by navigating from a new sum to an adjacent number bond they know, i.e. 5 + 2 and 4 ...

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]

  5. Yoruba numerals - Wikipedia

    en.wikipedia.org/wiki/Yoruba_numerals

    Multiples are also very important in the numerical system for example the number 60 is ọgọ́ta which literally means three twenties (ogún = 20, ẹ̀ta = 3). Up to 30, Yoruba has distinct forms of the numerals for counting objects, which derive from counting cowries .

  6. Vigesimal - Wikipedia

    en.wikipedia.org/wiki/Vigesimal

    For example, 20 altar, 40 alto-altar (2 times 20), 60 iski-altar (3 times 20) etc. In East Asia, the Ainu language also uses a counting system that is based around the number 20. "hotnep" is 20, "wanpe etu hotnep" (ten more until two twenties) is 30, "tu hotnep" (two twenties) is 40, "ashikne hotnep" (five twenties) is 100.

  7. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system. They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded. However, because of the length of large numbers, tallies ...

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