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How To Read a Ruler

Watch more Basic Math Skills videos: Subscribe to Howcast's YouTube Channel - Learn how to read a ruler with a few simple steps. Howcast uploads the highest quality how-to videos daily! Be sure to check out our playlists for guides that interest you: Subscribe to Howcast's other YouTube Channels: Howcast Health Channel - Howcast Video Games Channel - Howcast Tech Channel - Howcast Food Channel - Howcast Arts & Recreation Channel - Howcast Sports & Fitness Channel - Howcast Personal Care & Style Channel - Howcast empowers people with engaging, useful how-to information wherever, whenever they need to know how. Emphasizing high-quality instructional videos, Howcast brings you experts who provide accurate information in easy-to-follow tutorials on everything from makeup, hairstyling, nail art design, and soccer to parkour, skateboarding, dancing, kissing, and much, much more. Step 1: Pick a side Pick a side to use for your measurement. One side measures 30 centimeters, and the other side of the ruler measures 12 inches. Step 2: Multiply by 10 Multiply centimeters by 10 to calculate millimeters. For example, 1.2 centimeters equals 12 millimeters. Tip Centimeters are the longer marks on the metric side of the ruler; millimeters are the shorter marks. Step 3: Recognize the line differences Recognize the different line lengths on the English side of the ruler. The inch line is the longest line with the number next to it. The shorter lines represent fractions of an inch. Step 4: Identify the 15 other lines Identify the other 15 lines. They decrease in size from 1/2 to 1/4 of an inch, all the way down to 1/16 of an inch. Tip Some rulers display measurements down to 1/64 of an inch. Step 5: Convert to fractions Convert the fractions into decimals using a calculator. Divide the fraction of the inch and then add the whole number. The English side is more complicated than the metric side, since there are 12 inches in a foot rather than the increments of 10 used on the metric side, but once you have mastered the conversions, you can use your knowledge to measure just about any length. Did You Know? The first recorded unit of measure was the cubit, developed by the Egyptians. The cubit was the length from a man's elbow to the end of his middle finger, about 20.6 inches.
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