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  2. Number bond - Wikipedia

    en.wikipedia.org/wiki/Number_bond

    What is a Number Bond? - visual explanation of number bonds, and link to free printables. Let's play math: Number bonds; Number Bond Worksheet; Number Bonds to 20 - Free printable PDF number bonds to 20 worksheet (number bonds to 10 and to 100 also available) Making sense of number bonds. - A detailed explanation of what number bonds are.

  3. List of Mersenne primes and perfect numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_Mersenne_primes...

    [7] [8] [9] It is widely believed, [10] but not proven, that no odd perfect numbers exist; numerous restrictive conditions have been proven, [10] including a lower bound of 10 1500. [11] The following is a list of all 52 currently known (as of January 2025) Mersenne primes and corresponding perfect numbers, along with their exponents p.

  4. 10 - Wikipedia

    en.wikipedia.org/wiki/10

    10 (ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system , the most common system of denoting numbers in both spoken and written language. Linguistics

  5. Number theory - Wikipedia

    en.wikipedia.org/wiki/Number_theory

    Number fields are often studied as extensions of smaller number fields: a field L is said to be an extension of a field K if L contains K. (For example, the complex numbers C are an extension of the reals R, and the reals R are an extension of the rationals Q.) Classifying the possible extensions of a given number field is a difficult and ...

  6. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    He also writes that "no attempt has been made to explain why a tally of something should exhibit multiples of two, prime numbers between 10 and 20, and some numbers that are almost multiples of 10." [ 2 ] Alexander Marshack examined the Ishango bone microscopically, and concluded that it may represent a six-month lunar calendar .

  7. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    A column of two numbers, with the lower number in red, usually indicates that the lower number in the column is to be subtracted, with the difference written below, under a line. This is most common in accounting. Formally, the number being subtracted is known as the subtrahend, [4] [5] while the number it is subtracted from is the minuend.

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