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1.1       root        1: .\"    @(#)arithmetic.6        6.2 (Berkeley) 5/6/86
                      2: .\"
                      3: .TH ARITHMETIC 6  "May 6, 1986"
                      4: .AT 3
                      5: .SH NAME
                      6: arithmetic \- provide drill in number facts
                      7: .SH SYNOPSIS
                      8: .B /usr/games/arithmetic
                      9: [
                     10: .B +\-x/
                     11: ] [ range ]
                     12: .SH DESCRIPTION
                     13: .I Arithmetic
                     14: types out simple arithmetic problems, and waits for an answer to be typed in.
                     15: If the answer is correct, it types back \*(lqRight!\*(rq, and a new problem.
                     16: If the answer is wrong, it replies \*(lqWhat?\*(rq,
                     17: and waits for another answer.
                     18: After every twenty problems, it publishes
                     19: statistics on correctness and the time required to answer.
                     20: .PP
                     21: To quit the program, type an interrupt (delete).
                     22: .PP
                     23: The first optional argument determines the kind of problem to be generated;
                     24: .B +\-x/
                     25: respectively cause addition, subtraction, multiplication, and division
                     26: problems to be generated.
                     27: One or more characters can be given;
                     28: if more than one is given, the different types of
                     29: problems will be mixed in random order; default is
                     30: .B +\-.
                     31: .PP
                     32: .I Range
                     33: is a decimal number;
                     34: all addends, subtrahends, differences, multiplicands, divisors,
                     35: and quotients will be less than or equal to the value of
                     36: .IR range .
                     37: Default
                     38: .I range
                     39: is 10.
                     40: .PP
                     41: At the start, all numbers less than or equal to
                     42: .I range
                     43: are equally likely to appear.
                     44: If the respondent makes a mistake,
                     45: the numbers in the problem which was missed
                     46: become more likely to reappear.
                     47: .PP
                     48: As a matter of educational philosophy, the program will
                     49: not give correct answers, since the learner should, in principle,
                     50: be able to calculate them.
                     51: Thus the program is intended to provide drill for
                     52: someone just past the first learning stage, not to teach number facts
                     53: .I de
                     54: .IR novo .
                     55: For almost all users, the relevant statistic should be
                     56: time per problem, not percent correct.

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