

Arithmetic  Wikipedia, the free encyclopedia (Site not responding. Last check: 20071007) 
  Arithmetic or arithmetics (from the Greek word αριθμός = number) in common usage is a branch of (or the forerunner of) mathematics which records elementary properties of certain operations on numerals, though in usage by professional mathematicians, it often is treated as synonym for number theory. 
  The traditional arithmetic operations are addition, subtraction, multiplication and division, although more advanced operations (such as manipulations of percentages, square root, exponentiation, and logarithmic functions) are also sometimes included in this subject. 
  The arithmetic of natural numbers, integers, rational numbers (in the form of vulgar fractions), and real numbers (using the decimal placevalue system known as algorism) is typically studied by schoolchildren, who learn manual algorithms for arithmetic. 
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