Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 2 - Cumulative Review - Page 161: 29



Work Step by Step

$9^{2}=81$ because $9\times9=81$. You can check any number $\leq100$ to see if it is a multiple of 9 because if so, its digits will add up to $9$.
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