Calculation problem that strengthens “5”_01@20

This is a collection of PDF arithmetic and calculation questions.
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It is a random problem of insect-eating calculation of combinations that add to 5, calculation of adding 5 to 1~5, subtracting something from 5, and subtracting 5 from numbers up to 10.

There are 20 questions on one page. 200 pages. I don’t see the same problem on one page. 20 questions are randomly extracted from 22 questions.

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