Thinking Mathematically (6th Edition)

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

Chapter 4 - Number Representation and Calculation - 4.4 Looking Back at Early Numeration Systems - Exercise Set 4.4: 31

Answer

$CXXIX$

Work Step by Step

RECALL: $C=100 \\L=50 \\X=10 \\V=5 \\I=1$ When a smaller number is written before a bigger number, the smaller number is subtracted to the bigger number. Note that: $129 = 100 + 20 + 9 \\129 = 100 + 10 + 10 + (10-1) \\129=CXXIX$
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