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: 48


$49 = XLIX$

Work Step by Step

RECALL: $L=50 \\X=10 \\V=5 \\I=1$ When a smaller numeral is written before a bigger numeral, the value of the smaller is subtracted to the value of the bigger numeral. Note that: $49 = 40+9 \\49 = (50-10) + (10-1) \\49 = XLIX$
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