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Also, be aware that 30 cm does not directly equal 12 inches, even though they are often put on the same ruler! Let’s start by looking at how to read a ruler in inches. If you’re American, this is the measurement you probably know better than centimeters, which are sometimes included on your standard 12-inch, or 1-foot, ruler (we’ll go over how to read a ruler in cm in the next section).
Now, notice the lines between each inch, with some longer and some shorter than others. Each of these tiny lines represents a fraction of an inch. There are five different lengths of lines in total. There are two types of rulers you can use: the inch, or imperial, ruler and the centimeter, or metric, ruler. This is especially important to know if you’re studying science (recall that science generally uses the metric system —not the imperial system). Knowing how to read a ruler in cm is also helpful for people who'd prefer to not work with fractions (which you must do with inches) and who'd like to work with other units instead (in this case, millimeters).
6 Additional Resources for Learning to Read a Ruler
Example: Say you’re measuring a piece of cloth and the ruler ends at the fourth line after the 10-inch mark. This would mean that the cloth is 10 1/4 (10.25) inches long.
If you counted in 1/4 inches on a ruler, you'd see that the fourth line after 0 inches equals 1/4 inch, the eighth line equals 2/4 (1/2) inch, and the 12th line equals 3/4 inch. Example: You’re trying to measure the length of your pointer finger. The ruler comes to the seventh line past 3 inches. This would mean that your finger is 3 7/16 inches long. Part of the Visual Stress Collection: a previous winning product of the Education Resources Awards SEN Resource of the Year.
How to Read a Ruler: Imperial vs Metric
Example: Say you decide to measure the length of a corn on the cob. You find that your ruler comes to the second line after the 6-inch mark. This would mean that the corn is 6 1/8 inches long. Inches correspond to the imperial system, which is the main measuring system used in the US and a smattering of other countries. These reading rulers are made of transparent plastic that both underlines the text by the use of an opaque line and highlights it in a coloured tint. One side of the ruler is gloss and the other matt.
Example: You take out a ruler to measure the width of your fingernail. The ruler stops at 1 cm, meaning that your nail is precisely 1 cm wide. Example: If you were to measure the length of a sheet of computer paper, the piece of paper would come up to the 11-inch mark on your ruler, indicating that it's exactly 11 inches long. Launched in 2004 to provide a user-friendly alternative for Irlen Syndrome sufferers who resist using the more intrusive large overlays, these reading rulers combine the following features: - If you want any extra assistance with learning how to read a ruler in cm or inches, videos and worksheets can be excellent resources.
There will always be 10 lines from one centimeter to the next centimeter. In total, there are three different lengths of lines on a metric ruler. The middle-length line on a metric ruler is the 1/2 (0.5) centimeter line, which comes midway between every centimeter (in other words, it's the fifth line after every whole centimeter): The 1/2-inch line is located midway between every inch on a ruler. The midpoint between 7 and 8 inches, for instance, would be 7 1/2 (or 7.5) inches.
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