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How do I read a ruler?Terminology

A ruler used to be called a rule, and rulers would be rules. Today, the more commonly found term is ruler. The dictionary defines both the term rule and ruler, so either can be used, and for this document I will only use the term ruler.

Metric Rulers

Metric rulers are fairly easy to read. They deal with centimeters and millimeters only. You wont have to worry much about fractions.

Take a look at the following Metric Ruler.

The larger lines with numbers are centimeters, and the smallest lines are millimeters. Since millimeters are 1/10th of a centimeter, if you measure 7 marks after a centimeter, it is 1.7 centimeters long.

English Rulers

English rulers, are much more difficult to read. Mostly because they deal with fractions, which are a bit more dificult to learn.

Take a look at the following English Rulers.

A ruler marked in 8ths....