Answer
$81$
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 $9$.
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 2 - Cumulative Review - Page 161: 29
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