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  2. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    When the golden ratio is used as the base of a numeral system (see golden ratio base, sometimes dubbed phinary or ⁠ ⁠-nary), quadratic integers in the ring ⁠ [] ⁠ – that is, numbers of the form ⁠ + ⁠ for ⁠ ⁠ and ⁠ ⁠ in ⁠ ⁠ – have terminating representations, but rational fractions have non-terminating representations.

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    In decimal numbers greater than 1 (such as 3.75), the fractional part of the number is expressed by the digits to the right of the separator (with a value of 0.75 in this case). 3.75 can be written either as an improper fraction, ⁠ 375 / 100 ⁠, or as a mixed number, ⁠3 + 75 / 100 ⁠.

  4. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    In the second step, they were divided by 3. The final result, ⁠ 4 / 3 ⁠, is an irreducible fraction because 4 and 3 have no common factors other than 1. The original fraction could have also been reduced in a single step by using the greatest common divisor of 90 and 120, which is 30. As 120 ÷ 30 = 4, and 90 ÷ 30 = 3, one gets

  5. Continued fraction - Wikipedia

    en.wikipedia.org/wiki/Continued_fraction

    The sequence {Τ n} may produce no more than a finite number of zero denominators B i. while the subsequence of finite convergents dances wildly around the plane in a pattern that never repeats itself and never approaches any finite limit either. Interesting examples of cases 1 and 3 can be constructed by studying the simple continued fraction

  6. 4 - Wikipedia

    en.wikipedia.org/wiki/4

    The number of completed, numbered symphonies by Johannes Brahms. [90] The number of strings on a violin, a viola, a cello, double bass, a cuatro, a typical bass guitar, and a ukulele, and the number of string pairs on a mandolin. "Four calling birds" is the gift on the fourth day of Christmas in the carol "The Twelve Days of Christmas". [91]

  7. Exponentiation - Wikipedia

    en.wikipedia.org/wiki/Exponentiation

    In mathematics, exponentiation, denoted b n, is an operation involving two numbers: the base, b ( a constant ), and the exponent or power, n (a variable). [1] When n is a positive integer, exponentiation corresponds to repeated multiplication of the base: that is, b n is the product of multiplying n bases: [1] = ⏟.

  8. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Numbers can count (3 apples), order (the 3rd apple), or measure (3.5 feet high); as the history of mathematics has progressed from counting on our fingers to modelling quantum mechanics, multiplication has been generalized to more complicated and abstract types of numbers, and to things that are not numbers (such as matrices) or do not look ...

  9. Number sentence - Wikipedia

    en.wikipedia.org/wiki/Number_sentence

    A valid number sentence that is true: 83 + 19 = 102. A valid number sentence that is false: 1 + 1 = 3. A valid number sentence using a 'less than' symbol: 3 + 6 < 10. A valid number sentence using a 'more than' symbol: 3 + 9 > 11. An example from a lesson plan: [6] Some students will use a direct computational approach.

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