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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First you must find the delta. When you find it place a dot at the farthest corner of it. then place a dot at the center of the fingerprint. With a ruler connect the dots and count the lines which intersect the line you just drew.
you read a ruler by conting the little lines first
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If the lines are on the opposite side of the inches on the ruler, then yes. You must keep in mind, however, that a ruler is used for inches and that the centimeters may not be marked.
The millimeters on a ruler are the tiny lines in between each centimeter