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Unix Version 7 - man page for arithmetic (v7 section 6)

ARITHMETIC(6)				   Games Manual 			    ARITHMETIC(6)

       arithmetic - provide drill in number facts

       /usr/games/arithmetic [ +-x/ ] [ range ]

       Arithmetic  types  out simple arithmetic problems, and waits for an answer to be typed in.
       If the answer is correct, it types back "Right!", and a new problem.   If  the  answer  is
       wrong,  it  replies "What?", and waits for another answer.  Every twenty problems, it pub-
       lishes statistics on correctness and the time required to answer.

       To quit the program, type an interrupt (delete).

       The first optional argument determines the kind of problem to be generated;  +-x/  respec-
       tively cause addition, subtraction, multiplication, and division problems to be generated.
       One or more characters can be given; if more than one is given,	the  different	types  of
       problems will be mixed in random order; default is +-

       Range is a decimal number; all addends, subtrahends, differences, multiplicands, divisors,
       and quotients will be less than or equal to the value of range.	Default range is 10.

       At the start, all numbers less than or equal to range are equally likely  to  appear.   If
       the  respondent	makes  a mistake, the numbers in the problem which was missed become more
       likely to reappear.

       As a matter of educational philosophy, the program will not give  correct  answers,  since
       the learner should, in principle, be able to calculate them.  Thus the program is intended
       to provide drill for someone just past the first learning stage, not to teach number facts
       de  novo.   For	almost	all users, the relevant statistic should be time per problem, not
       percent correct.


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