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  2. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    The primes form an infinite sequence 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ... Composite number : A positive integer that can be factored into a product of smaller positive integers. Every integer greater than one is either prime or composite.

  3. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Second example: 87 x 11 = 957 because 8 + 7 = 15 so the 5 goes in between the 8 and the 7 and the 1 is carried to the 8. So it is basically 857 + 100 = 957. Or if 43 x 11 is equal to first 4+3=7 (For the tens digit) Then 4 is for the hundreds and 3 is for the tens. And the answer is 473.

  4. Mathematical coincidence - Wikipedia

    en.wikipedia.org/wiki/Mathematical_coincidence

    That is, where m is the number of miles, k is the number of kilometres and e is Euler's number. A density of one ounce per cubic foot is very close to one kilogram per cubic metre: 1 oz/ft 3 = 1 oz × 0.028349523125 kg/oz / (1 ft × 0.3048 m/ft) 3 ≈ 1.0012 kg/m 3 .

  5. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The 107 represents a denominator of 10 7. Dividing by 10 7 moves the decimal point seven places to the left. A decimal fraction with infinitely many digits to the right of the decimal separator represents an infinite series. For example, ⁠ 1 / 3 ⁠ = 0.333... represents the infinite series 3/10 + 3/100 + 3/1000 + ....

  6. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    Coverage of this topic in Smithsonian magazine describes the Numberphile video as misleading and notes that the interpretation of the sum as ⁠− + 1 / 12 ⁠ relies on a specialized meaning for the equals sign, from the techniques of analytic continuation, in which equals means is associated with. [35]

  7. Power of 10 - Wikipedia

    en.wikipedia.org/wiki/Power_of_10

    Visualisation of powers of 10 from one to 1 trillion. In mathematics, a power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ...

  8. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  9. 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