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  2. Pre-math skills - Wikipedia

    en.wikipedia.org/wiki/Pre-math_skills

    Pre-math skills (referred to in British English as pre-maths skills) are math skills learned by preschoolers and kindergarten students, including learning to count numbers (usually from 1 to 10 but occasionally including 0), learning the proper sequencing of numbers, learning to determine which shapes are bigger or smaller, and learning to count objects on a screen or book.

  3. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

  4. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    The counting numbers are another term for the natural numbers, particularly in primary school education, and are ambiguous as well although typically start at 1. [ 4 ] The natural numbers are used for counting things, like "there are six coins on the table", in which case they are called cardinal numbers .

  5. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    In the Etruscan system, the symbol 1 was a single vertical mark, the symbol 10 was two perpendicularly crossed tally marks, and the symbol 100 was three crossed tally marks (similar in form to a modern asterisk *); while 5 (an inverted V shape) and 50 (an inverted V split by a single vertical mark) were perhaps derived from the lower halves of ...

  6. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    When placed after special sets of numbers, plus and minus signs are used to indicate that only positive numbers and negative numbers are included, respectively. For example, Z + {\displaystyle \mathbb {Z} ^{+}} is the set of all positive integers and Z − {\displaystyle \mathbb {Z} ^{-}} is the set of all negative integers.

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