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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. 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. The second-biggest unit on a ruler is the 1/2 inch, which is represented by the second-longest line. These typically aren't labeled but might be on some rulers (in which case you'd see numbers such as 1 1/2 in, 2 1/2 in, etc.). Meanwhile, centimeters are part of the metric system, which is used around the world in both everyday life and science.
A sufficiently wide range of colors to meet the needs of all children who will benefit from using a colored overlay product Inches correspond to the imperial system, which is the main measuring system used in the US and a smattering of other countries.
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Right away, you should be able to tell that this ruler uses inches, as it’s divided into 12 equally spaced areas (labeled 1-12), and we know there are 12 inches in a foot (ignore the cm below). While we will be providing pictures you can use to follow our instructions, we recommend getting out your own ruler or measuring tape so you can follow along in real time. You can tell that this is a metric ruler because it’s divided into 30 equally spaced sections and has "cm" written on it(ignore the inches below).
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. Rulers are an essential tool to have, but if you’re struggling with how to read a ruler, you're not alone. There are so many lines on a ruler, it can get confusing to figure out what they all mean. If you counted in 1/8-inch increments, you'd find that the second line after 0 equals 1/8 inch, the fourth line 2/8 (1/4) inch, the sixth line 3/8 inch, the eighth line 4/8 (2/4 or 1/2) inch, the 10th line 5/8 inch, the 12th line 6/8 (3/4) inch, and the 14th line 7/8 inch. The inch is the biggest unit on a ruler and is represented by the longest line. Each 1-inch line is labeled with a number indicating what inch it is on the ruler (as the image above shows). The longest line represents the biggest unit on the ruler: 1 cm. Each centimeter is labeled on the ruler (1-30).
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: 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. In this guide, we’ll explain why you should know how to read a ruler and give you step-by-step instructions on how to read a ruler in inches and cm. We’ll also provide you with some helpful resources you can use to keep honing your ruler-reading skills.
It’s pretty obvious that knowing how to read a ruler is important to not just your grades in school but also your day-to-day life. 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). For example, if you wanted to make something out of construction paper, you'd likely need to use a ruler to measure out how much of the material you would need. Or what if you wanted to frame a photo you have? In this case, you might have to measure the picture to see what kind of frame it would fit in.
How to Read a Ruler: Imperial vs Metric
Part of the Visual Stress Collection: a previous winning product of the Education Resources Awards SEN Resource of the Year. 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. There have been huge advances in technology over the past decade, allowing for increasingly powerful assistive software to be created to help people overcome literacy difficulties. Sometimes however, the most effective tool that can be used is not complicated software, but instead something much simpler. All of these resources, in addition to the handful of practice questions we gave you above, should be enough to get you reading a ruler in no time at all!
Also, be aware that 30 cm does not directly equal 12 inches, even though they are often put on the same ruler! 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. 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): There are two types of rulers you can use: the inch, or imperial, ruler and the centimeter, or metric, ruler. Example: If you were to measure the width (instead of length) of a piece of computer paper, the piece should come up exactly to the 1/2 inch line between 8 and 9 inches, indicating that the width is 8 1/2 (8.5) inches.You’re measuring a pair of glasses, from the end of one lens to the far end of the other lens. Your ruler reaches the seventh line past 12 cm. How long is the pair of glasses? Example: Say you're measuring the width of your smartphone, and it comes up to the fifth line after 4 cm on your ruler. This would mean that the phone is 4.5 cm (45 mm) wide.
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