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You count them using natural numbers: 1, 2, 3, and so on. If there are 10 lines between the 5 cm mark and the 6 cm mark then each is worth 1/10 cm. Similarly, if there are 16 lines between the 3 inch and 4 inch marks then each line is worth 1/16 inches.

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7y ago
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Q: How do you count the lines on a ruler?
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