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Use tally marks informally

Tally marks provide a one-to-one representation of how many times an item or category occurs: each mark represents one counted object or response, and a completed group of five supports efficient counting and comparison. The learner interprets the total number of marks as a data frequency, recognizing that the grouping mark is still part of the count; formal statistical tables, larger-scale data analysis, and generalized tally notation are not included.

Detailed Explanation: Use tally marks informally

A tally mark stands for one object. Make one mark for each thing you count. When you reach five, draw a diagonal mark across four straight marks. That group has five marks.

Example: Count 9 shells.

  1. Count the first shell and draw: |
  2. Add one mark for each shell:
    • 4 shells: ||||
    • 5 shells: ||||/
    • 6 shells: ||||/ |
    • 7 shells: ||||/ ||
    • 8 shells: ||||/ |||
    • 9 shells: ||||/ ||||

Now count the tally marks:

  • The first group is 55.
  • The four marks after it are 44.

So, 5+4=95+4=9. The shells occur 9 times. Remember: the diagonal grouping mark is part of the count—it is the fifth mark.

Learn by doing: Use tally marks informally

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    Graphing - Tally Chart - Read Value

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