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Key Concepts — Quick Reference
This chapter
Tally marks and counting in fives
| One stroke | | = 1 (a single vertical line for each item) |
|---|---|
| Bundle of five | 4 vertical strokes + 1 diagonal across them = 5 |
| Reading a tally | (complete bundles x 5) + leftover single strokes |
| Frequency | the total count for one category = sum of its tally marks |
Pictograph key and reading bar graphs
| Pictograph key/scale | 1 symbol = a fixed number of items (e.g. 1 apple = 2 children) |
|---|---|
| Pictograph value | (number of full symbols x key) + (half symbol = half the key) |
| Bar graph value | trace the top of the bar across to the scale axis and read it off |
| How many more | larger frequency - smaller frequency (subtract the two values) |