Thinking Mathematically (6th Edition)

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

Chapter 5 - Number Theory and the Real Number System - Chapter Summary, Review, and Test - Review Exercises: 113


$420 \times 10^{11} = 4.2 \times 10^{13}$

Work Step by Step

Move the decimal point two places to the left to get $4.2$. Then, multiply by $10^{2}$ (or increase the exponent of 10 by 2) to retain the original value. $420 \times 10^{11} = 4.20 \times 10^{11+2}=4.2 \times 10^{13}$
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