There are two types of scales commonly used on rulers; Fractional and Decimal. Decimal Rulers have graduations or marks which are based on the decimal system such as 0.
Decimal Rulers can be based on any measuring system but are usually based on either the English measurement system inches in or the Metric measurement system of millimeters mm , centimeters cm and meters m. You might see inches on the other side of your metric ruler. In this case, refer to the instructions above to learn how to read a ruler in inches. Also, be aware that 30 cm does not directly equal 12 inches, even though they are often put on the same ruler!
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 longest line represents the biggest unit on the ruler: 1 cm. Each centimeter is labeled on the ruler 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: 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. The smallest unit a metric ruler can measure is 1 mm, or 0. The strand comes to the ninth line after 16 cm on the ruler. This would mean the strand is If you want any extra assistance with learning how to read a ruler in cm or inches, videos and worksheets can be excellent resources. 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!
Got questions about decimals and fractions? Our expert guides will teach you how to convert decimals to fractions and how to add and subtract fractions. Learn the inch marks. A ruler is made up of 12 inch marks. These are typically the numbered marks on the ruler and are denoted by the longest lines on the ruler.
For example, if you need to measure a nail, place one end directly on the left side of the ruler. If it ends directly above the long line next to the large number 5, then the nail is 5 inches long. In total, there are 24 of these marks on a 12 inch ruler. Mark where the tip of the pencil lead ends on the ruler. There are a total of 48 of these marks on a 12 inch ruler.
In total, there are 96 of these marks on a 12 inch ruler. These are also the smallest lines on the ruler. There are a total of of these lines on the ruler. If you plan on measuring things that are small or you need to be extremely accurate, make sure the ruler you use has these marks. Method 2. Get a metric ruler. A metric ruler is based on the International System of Units SI , sometimes called the metric system, and is divded into either millimeters or centimeters instead of inches.
Rulers are often 30 centimeters long, which are designated by large numbers on the ruler. Between each centimeter cm mark, there should be 10 smaller marks called millimeters mm. If you are measuring an object, align it with the left side of the zero mark on the ruler.
The left side of the line where the object ends will be its measurement in centimeters. This way the line thickness will not affect the measurement. Unlike with the English ruler, the measurements for the metric ruler are written in decimals instead of fractions.
Learn the centimeter marks. The large numbers next to the longest lines on the ruler denote the centimeter marks. A metric ruler has 30 of these marks. For example, place the bottom of a crayon on the far left side of the ruler to measure it. Note where the tip falls.
If the crayon ends directly on the long line next to the large number 14, your crayon is exactly 14cm long. There are a total of 60 of these marks on a 30 cm ruler. Your button is 1.
For example, to measure 0. Learn the millimeter marks. Between each 0. There are a total of 10 lines per centimeter, with the 0. There are millimeter marks on a 30 cm ruler.
The If Janet made the recipe with the least amount of sugar three times, how much sugar would she need? If Janet made the recipe with the largest amount of sugar three times, how much sugar would she need? Make a line plot from these measurements lengths of cockroaches, in inches, in Jake's collection :. This time, you will need to do the scaling on the number line. Jake took his five longest cockroaches, and placed them end-to-end.
Then make a line plot of your data. A self-teaching worktext for 5th grade that teaches fractions and their operations with visual models.
The book covers fractions, mixed numbers, adding and subtracting like fractions, adding and subtracting mixed numbers, adding and subtracting unlike fractions, and comparing fractions. Learn more and see the free samples!
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