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  2. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    800-72-856 780: 1220: 71-850 760: 1210: 70-843 745: 1114: 68-837 725: 1060: 67-829 712: 1021: 66-824 682: 940: 65-812 668: 905: 64-806 652: 867: 63-799 626: 803: 62-787 614: 775: 61-782 601: 746: 60-776 590: 727: 59-770 576: 694: 57-763 552: 649: 56-751 545: 639: 55-748 529: 606: 54-739 514: 587: 53: 120: 731 502: 565: 52: 119: 724 495: 551: 51 ...

  3. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

  4. Casio Databank - Wikipedia

    en.wikipedia.org/wiki/Casio_Databank

    A Casio DBC-610 Databank calculator watch. Casio DBA-800 Databank, the world's first phone dialer watch. Casio Databank (often styled as CASIO DATA BANK) is a series of digital watches and electronic personal organizers manufactured by Casio. The watches allow data storage for names and telephone numbers, memos, and in late editions, email ...

  5. Instructions per second - Wikipedia

    en.wikipedia.org/wiki/Instructions_per_second

    Instructions per second. Instructions per second ( IPS) is a measure of a computer 's processor speed. For complex instruction set computers (CISCs), different instructions take different amounts of time, so the value measured depends on the instruction mix; even for comparing processors in the same family the IPS measurement can be problematic.

  6. Square foot - Wikipedia

    en.wikipedia.org/wiki/Square_foot

    Comparison of 1 square foot with some Imperial and metric units of area. The square foot (pl. square feet; abbreviated sq ft, sf, or ft 2; also denoted by ' 2) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Canada, the United Kingdom, Bangladesh, India, Nepal, Pakistan, Ghana, Liberia, Malaysia, Myanmar, Singapore and ...

  7. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Basic calculators usually store only one number at a time; ... The first European-made pocket-sized calculator, DB 800 ... Comparison of HP graphing calculators;

  8. NerdWallet - Wikipedia

    en.wikipedia.org/wiki/NerdWallet

    NerdWallet was founded in August 2009 by Tim Chen and Jacob Gibson, with an initial capital investment of $800. Its first product was a web application that provided comparative information about credit cards. Subsequently, it generated large quantities of content to help boost its search engine results.

  9. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    800999: Class F; 600–799: Class G; 400–599: Class H; 200–399: Class I; 100–199: Class J; The K-factor used by the USCF. The K-factor, in the USCF rating system, can be estimated by dividing 800 by the effective number of games a player's rating is based on (N e) plus the number of games the player completed in a tournament (m).

  10. Direct comparison test - Wikipedia

    en.wikipedia.org/wiki/Direct_comparison_test

    In mathematics, the comparison test, sometimes called the direct comparison test to distinguish it from similar related tests (especially the limit comparison test ), provides a way of deducing the convergence or divergence of an infinite series or an improper integral. In both cases, the test works by comparing the given series or integral to ...

  11. 800 (number) - Wikipedia

    en.wikipedia.org/wiki/800_(number)

    800 (eight hundred) is the natural number following 799 and preceding 801. It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40.