ARITHMETIC(6)                                       ARITHMETIC(6)

          arithmetic - 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 publishes statistics on correct-
          ness 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/ respectively cause addition, subtrac-
          tion, 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 ran-
          dom order; default is +-

          Range is a decimal number; all addends, subtrahends, differ-
          ences, 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 mis-
          take, 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 princi-
          ple, 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.