```1`ARITHMETIC(6)                    Games Manual                    ARITHMETIC(6)`
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## NAME

```6`       arithmetic - provide drill in number facts`
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## SYNOPSIS

```9`       /usr/games/arithmetic [ +-x/ ] [ range ]`
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## DESCRIPTION

```12`       Arithmetic  types  out  simple  arithmetic  problems,  and waits for an`
13`       answer to be typed in.   If  the  answer  is  correct,  it  types  back`
14`       "Right!",  and  a  new  problem.   If  the  answer is wrong, it replies`
15`       "What?", and waits for another answer.  Every twenty problems, it  pub‐`
16`       lishes statistics on correctness and the time required to answer.`
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18`       To quit the program, type an interrupt (delete).`
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20`       The first optional argument determines the kind of problem to be gener‐`
21`       ated; +-x/ respectively cause  addition,  subtraction,  multiplication,`
22`       and  division  problems to be generated.  One or more characters can be`
23`       given; if more than one is given, the different types of problems  will`
24`       be mixed in random order; default is +-`
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26`       Range  is a decimal number; all addends, subtrahends, differences, mul‐`
27`       tiplicands, divisors, and quotients will be less than or equal  to  the`
28`       value of range.  Default range is 10.`
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30`       At  the  start,  all  numbers  less  than or equal to range are equally`
31`       likely to appear.  If the respondent makes a mistake,  the  numbers  in`
32`       the problem which was missed become more likely to reappear.`
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34`       As  a  matter of educational philosophy, the program will not give cor‐`
35`       rect answers, since the learner should, in principle, be able to calcu‐`
36`       late  them.   Thus the program is intended to provide drill for someone`
37`       just past the first learning stage, not to teach number facts de  novo.`
38`       For  almost  all users, the relevant statistic should be time per prob‐`
39`       lem, not percent correct.`
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43`                                                                 ARITHMETIC(6)`
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