Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 4 - Number Representation and Calculation - Chapter Summary, Review, and Test - Review Exercises - Page 245: 47



Work Step by Step

RECALL: $M=1000 \\C=100 \\X=10$ Note that when a smaller numeral is written before a bigger numeral, the value of the smaller is subtracted to the value of the bigger numeral. Thus, $MCMXC = 1000+(1000-100)+(100-10) = 1000+900+90=1990$
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