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-.TH ARITHMETIC 6
-.CT 1 inst_info
-.SH NAME
-arithmetic \- drill in number facts
-.SH SYNOPSIS
-.B /usr/games/arithmetic
-[
-.B +-x/
-]
-[
-.I range
-]
-.SH DESCRIPTION
-.I Arithmetic
-types out simple arithmetic problems,
-and waits for an answer to be typed in.
-If the answer is correct,
-it types back
-.LR Right! ,
-and a new problem.
-If the answer is wrong,
-it replies
-.L What? ,
-and waits for another answer.
-Every twenty problems, it publishes
-statistics on correctness and the time required
-to answer.
-.PP
-To quit the program,
-type an interrupt (delete).
-.PP
-The first optional argument determines the kind of problem
-to be generated;
-.B +-x/
-get
-addition, subtraction, multiplication, and division
-problems respectively.
-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
-.B +-
-.PP
-.I Range
-is a decimal number;
-all addends, subtrahends, differences, multiplicands, divisors,
-and quotients will be less than or equal to the value of
-.IR range .
-Default
-.I range
-is 10.
-.PP
-At the start, all numbers less than or equal to
-.I 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.
-.PP
-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
-.I de
-.IR novo .
-For almost all users,
-the relevant statistic should be
-time per problem, not percent correct.