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17 ) Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. [2-md4] Local/National Standards:
3. Place the end of the ruler at the edge of the object. To measure the length of an object in centimeters using a metric ruler, you first need to set the â0â edge of the ruler to the starting edge of the object to be measured. 1  Keep the ruler as flat and parallel against the measured edge of the object as possible.