2020 | OriginalPaper | Chapter
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Authors : Kseniya Garaschuk, Andy Liu
Published in: Grade Five Competition from the Leningrad Mathematical Olympiad
Publisher: Springer International Publishing
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All four problems are based on the operation of subtraction, the computation of differences. A practical scenario is the measurement of length. Suppose we align a marked ruler against a line segment. If the left endpoint corresponds to the marking of 3 cm and the right endpoint corresponds to the marking of 7 cm, then the length of the segment is 7 − 3 = 4 cm. We consider a related problem.