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How to use a ruler. A metric ruler is use to measure centimeter (cm) and millimeter (mm), the centimeter is a unit of length in the International System of Units; An English ruler provides incremental measurements in inches, with each inch further divided into smaller fractions.How to find a centimeter on a ruler?
To read a metric ruler to measure centimeters, look at the long lines on the ruler that are numbered 1-30 , which are the centimeter marks. The distance between them is equal to 1 centimeter. There are smaller lines between the larger centimeter lines, which represent millimeters.How many centimeters are in a standard ruler?
Most standard rulers are 30 centimeters long, which makes 1 centimeter equal to one-thirtieth of the length of a standard 12-inch, or 30-centimeter, ruler.How do you measure centimeters on a ruler?
Count the centimeters. After placing zero point of ruler besides the end of object, measure the centimeters. Then count the number of centimeter lines which the object covers e.g. your object may be 7 centimeter long. Remember to double check when counting the centimeter lines.