Clock arithmetic

Reference Topics 5-7

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Clock arithmetic and modular arithmetic
http://www.shodor.org/interactivate/discussions/morerem.html

This site gives a nice introduction to modular arithmetic.
http://betterexplained.com/articles/fun-with-modular-arithmetic/

This site is a nice interactive site which deals with arithmetic (mod m). Do not be frightened by the notation, the arithmetic table … See the whole entry

Section 5.7: Discrete Mathematics

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5.7 Outline

  1. Definition
  2. Clock arithmetic
    1. addition of a 12-hourclock
    2. elementary operations
      1. subtraction
      2. multiplication
      3. zero multiplication
      4. division
  3. Modulo five arithmetic
    1. addition of a 5-hour clock
    2. congruence modulo m
    3. solving modular equations
  4. Group properties for a modulo system
    1. testing group properties
    2. testing
… See the whole entry