It is not true to say that people don't use tally marks often - they do!
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It's just a line. One tally mark= | They are meant to keep score and then the 5th tally mark goes diagonal/across the first 4 marks
Tally marks can be used to count an amount of something, such as a score of a game. You make four lines and then on the fifth line, you put a line across the four. This makes for quick counting (by 5) and less clutter.
A frquency table shows a data set with tally marks.
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10 tallies of course, example: IIII IIII ---- ----