# What is 2 2 1 8

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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.

The center mark between numbers is 1/2. The red lines on these rulers are marked at 1/2, and 1. | |

The next smallest marks on a ruler are 1/4ths. The red marks on these rulers are at 1/4, 1/2, 3/4, and 1. (1/2 is the same as 2/4) | |

The next smallest marks on a ruler are 1/8ths. The red marks on these rulers are at 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, and 1. | |

The next smallest mark, if there are any, are 1/16ths. The red marks on this ruler are at 1/16, 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, and 1. |

When marking down a distance from a ruler, mark the whole inch, followed by a space, then the fraction of an inch.

For example, 1 1/2, or 2 3/8.

When entering fractions into the conversion calculators, you have to separate the whole number and the fraction with a + sign.

For example, 1+1/2, or 2+3/8.

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