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  2. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    The percentage change is ⁠ 20% − 30% / 30% ... one can count up the numbers between the subtrahend and the minuend. ... Printable Worksheets: ...

  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. 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.

  5. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    The number shown is 82. 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 ...

  6. Counting - Wikipedia

    en.wikipedia.org/wiki/Counting

    Number blocks, which can be used for counting. Counting is the process of determining the number of elements of a finite set of objects; that is, determining the size of a set. . The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the ...

  7. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    Counting assigns a natural number to each object in a set, starting with 1 for the first object and increasing by 1 for each subsequent object. The number of objects in the set is the count. This is also known as the cardinality of the set. Counting can also be the process of tallying, the process of drawing a mark for each object in a set.