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This article was co-written by Jessie Antonellis-John. Jessie Antonellis-John is a Math and Science instructor at Southwestern Oregon Community College. With over 10 years of experience, she specializes in curriculum development. Jessie holds a doctorate in Teaching & Teacher Training from the University of Arizona, a master’s degree in Education from Western Governors University, and a bachelor’s degree in astrophysics from Mount Hpyoke College. She has also co-authored several peer-reviewed articles in professional publications.
This article has been viewed 114,925 times.
There are two types of rulers: the inch scale divided by fractions, and the meter ruler divided by decimals. [1] X Research Source Reading measurements on a ruler might seem complicated with tiny lines, but it’s actually quite simple. Once you understand the basics listed below, you should have no trouble measuring with either type of ruler.
Steps
Read inch ruler
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Take an inch ruler. You will recognize this type of ruler because they have 12 lines representing the inches on the ruler. 12 inches is equal to 1 foot (0.305 m). Each foot is divided into several inches. Each inch is divided into 15 smaller lines, for a total of 16 lines per inch on the ruler. [2] X Research Source
- The longer the mark on the surface of the ruler, the larger the measurement. From 1 inch to 1/16 inch, the line will have the same size as the unit of measure.
- Make sure you read the ruler from left to right. If you are measuring an object, align the object to the left of the zero line on the ruler. The end of the object that touches the left of the line is the measure of the object in inches.
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Learn about inch marks. A ruler consists of 12 inch marks. They are usually numbered and represented by the longest line on the ruler. For example, if you want to measure a nail, place one end on the left side of the ruler. If the other end of the nail is directly above the long line next to the big 5, its length is 5 inches.
- Some rulers also number 1/2 inch, so be sure to use the largest number with the longest line as the inch mark.
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Learn about the 1/2 inch mark. The 1/2 inch mark will be the second longest line on the ruler, half an inch. Each 1/2 inch mark will be in between the two inch marks because it is half of each inch. This means that the line between 0 and 1 inch, 1 and 2 inch, 2 and 3 inch, etc. on the ruler, is a 1/2 inch mark. There are a total of 24 such marks on the 12-inch ruler. [3] X Research Sources
- For example, place the ruler next to the pencil with the eraser tip on the left side of the ruler. Mark the point of the pencil point on the ruler. If the pencil tip is on the shorter line between the 4 and 5 inch lines, your pencil is 4 and 1/2 inch long.
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Learn the 1/4 inch mark. In between the two 1/2 inch lines there will be a smaller line representing 1/4 inch. With the first inch, you will have 1/4, 1/2, 3/4, and 1 inch marks. Although 1/2 inch and 1 inch have their own markings, they are still part of the 1/4 inch measurement because 2/4 inch equals half inch and 4/4 inch equals 1 inch. There are a total of 48 1/4 inch marks on the 12 inch ruler. [4] X Research Sources
- For example, if you measure a carrot and its end falls on the line between the numbers 6 1/2 and 7 inches, that carrot is 6 and 3/4 inches long.
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Learn the 1/8 inch mark. This line is smaller and is located between two 1/4-inch lines. Between 0 and 1 inch there are lines indicating 1/8, 1/4 (or 2/8), 3/8, 1/2 (or 4/8), 5/8, 6/8 (or 3/4). ), 7/8, and 1 (8/8) inches. There are a total of 96 such marks on the 12-inch ruler. [5] X Research Sources
- For example, you measure a piece of fabric and the top of the piece of fabric touches the 6th line after the 4 inch mark, exactly between the 1/4 inch mark and the 1/2 inch mark. That means the fabric is 4 and 3/8 inches long.
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Learn the 1/16 inch mark. This small line is located between the two 1/8 inch lines and represents 1/16 inch. This is the smallest line on the ruler. The first smallest line to the left of the ruler is the 1/16 inch mark. Between 0 and 1 inch, there are lines indicating 1/16, 2/16 (or 1/8), 3/16, 4/16 (or 1/4), 5/16, 6/16 (or 3/) 8), 7/16, 8/16 (or 1/2), 9/16, 10/16 (or 5/8), 11/16, 12/16 (3/4), 13/16, 14/ 16 (or 7/8), 15/16, 16/16 (or 1) inch. There are a total of 192 such marks on the ruler. [6] X Research Source
- For example, you measure a flower stalk and the end of the flower stalk is at the 11th line after the 5 inch mark. So the flower stalk is 5 and 11/16 inches long.
- Not all rulers have 1/16 inch marks. If you are going to measure small objects that require very high precision, then make sure the ruler you use has such markings.
Read meter ruler
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Get a meter ruler. The metric scale is based on the International System of Measurements (SI), also sometimes called the metric system, and is divided into millimeters and centimeters instead of inches. Rulers of this type are usually 30 centimeters long, represented by large numbers on the ruler. Between two centimeter lines there are 10 small lines called millimeters (mm).
- Remember to read the ruler from left to right. If you are measuring an object, align it with the left side of the zero line on the ruler. The end of the object to the left of the line is the size of the object in centimeters. For this type of ruler, the thickness of the line does not affect the measurement.
- Unlike the yardstick, the metric measure is written as a decimal instead of a fraction. For example, 1/2 centimeter is written as 0.5 cm. [7] X Research Sources
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Learn centimeter lines. The large numbers next to the longest lines on the ruler represent the centimeter line. A meter ruler has 30 such marks. For example, place the flat end of the crayon on the left side of the ruler to measure the size of the pen. Mark the point of the tip. If the end of the pen is on the long line next to the number 14, then the wax pen is exactly 14cm long. [8] X Research Sources
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Learn the 1/2 centimeter mark. In the middle of each centimeter there is a slightly shorter line representing 1/2 centimeter, or 0.5cm. There are 60 such marks on the 30 cm ruler. [9] X Research Source
- For example, you want to measure a button and its edge touches the fifth line between the 1st and 2cm marks. Your button is 1.5cm long.
- For example, to measure 0.6cm, count one thick line (5mm) and one thin line (1mm).
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Learn millimeter lines. Between each 0.5cm line there are four more lines representing millimeters. Each centimeter has a total of 10 millimeter lines, of which the 0.5cm line is a 5 millimeter line, so each centimeter is 10mm long. There are 300 millimeter lines on the 30 cm ruler. [10] X Research Source
- For example, if you measure a piece of paper and the end of the paper touches the 7th line between the 24 and 25 centimeter lines, that means the piece of paper is 247mm long, or 24.7cm.
Advice
- To learn how to read a ruler, you need practice, especially how to convert measurements. Just remember to practice using the ruler and you’ll get better at it.
- Make sure you always use the correct side of the ruler while measuring. You don’t want centimeters and inches mixed up or your measurements incorrect. So remember that the yardstick has 12 large numbers and the meter ruler has 30 digits.
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This article was co-written by Jessie Antonellis-John. Jessie Antonellis-John is a Math and Science instructor at Southwestern Oregon Community College. With over 10 years of experience, she specializes in curriculum development. Jessie holds a doctorate in Teaching & Teacher Training from the University of Arizona, a master’s degree in Education from Western Governors University, and a bachelor’s degree in astrophysics from Mount Hpyoke College. She has also co-authored several peer-reviewed articles in professional publications.
This article has been viewed 114,925 times.
There are two types of rulers: the inch scale divided by fractions, and the meter ruler divided by decimals. [1] X Research Source Reading measurements on a ruler may seem complicated with tiny lines, but it’s actually quite simple. Once you understand the basics listed below, you should have no trouble measuring with either type of ruler.
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