Abstract
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.
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Garaschuk, K., Liu, A. (2020). Look Back. In: Grade Five Competition from the Leningrad Mathematical Olympiad. Problem Books in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-030-52946-8_4
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DOI: https://doi.org/10.1007/978-3-030-52946-8_4
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Publisher Name: Springer, Cham
Print ISBN: 978-3-030-52945-1
Online ISBN: 978-3-030-52946-8
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