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  2. Numeral prefix - Wikipedia

    en.wikipedia.org/wiki/Numeral_prefix

    3 tri-[m]ter-tern-, trin-terti-tri-[n]tris-[8] ("thrice") commontriakis- ("thrice") raretriplo- ("triple")triad- ("three of a kind"): trit-[9] ("third") [o]tritaio ...

  3. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    110 ÷ 5 = 22 (The result is the same as the original number divided by 5) If the last digit is 5. 85 (The original number) 8 5 (Take the last digit of the number, and check if it is 0 or 5) 8 5 (If it is 5, take the remaining digits, discarding the last) 8 × 2 = 16 (Multiply the result by 2) 16 + 1 = 17 (Add 1 to the result)

  4. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Because of the rules of division of signed numbers (which states in part that negative divided by positive is negative), − ⁠ 1 / 2 ⁠, ⁠ −1 / 2 ⁠ and ⁠ 1 / −2 ⁠ all represent the same fraction – negative one-half. And because a negative divided by a negative produces a positive, ⁠ −1 / −2 ⁠ represents positive one-half.

  5. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or ⁠ 20 / 5 ⁠ = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...

  6. Five nines - Wikipedia

    en.wikipedia.org/wiki/Five_nines

    Five nines, commonly taken to mean "99.999%", may refer to: High availability of services, when a service is available for 99.999% of the time, or around 5 minutes of downtime per year Nine (purity) , a 99.999% pure substance

  7. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    (The first 5 perfect numbers end with digits 6, 8, 6, 8, 6; but the sixth also ends in 6.) Philo of Alexandria in his first-century book "On the creation" mentions perfect numbers, claiming that the world was created in 6 days and the moon orbits in 28 days because 6 and 28 are perfect.

  8. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    For example, a percentage of 99.5% could be expressed as "two nines five" (2N5, or N2.5) [2] or as 2.3 nines, [citation needed] following from the logarithm definition. A percentage of 100% would, in theory, have an infinite number of nines – though, in the context of purity of materials, 100% is virtually unachievable.

  9. Number Forms - Wikipedia

    en.wikipedia.org/wiki/Number_Forms

    1 ⁄ 5: 0.2 Vulgar Fraction One Fifth 2155 8533 ⅖ 2 ⁄ 5: 0.4 Vulgar Fraction Two Fifths 2156 8534 ⅗ 3 ⁄ 5: 0.6 Vulgar Fraction Three Fifths 2157 8535 ⅘ 4 ⁄ 5: 0.8 Vulgar Fraction Four Fifths 2158 8536 ⅙ 1 ⁄ 6: 0.166... Vulgar Fraction One Sixth 2159 8537 ⅚ 5 ⁄ 6: 0.833... Vulgar Fraction Five Sixths 215A 8538 ⅛ 1 ⁄ 8: 0 ...