## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 4 - Number Representation and Calculation - 4.2 Number Bases in Positional Systems - Exercise Set 4.2 - Page 226: 4

#### Answer

$55$

#### Work Step by Step

The expanded form of $67_{\text{eight}}$ is: $=(6 \times 8^1) + (7 \times 1) \\=(6\times 8) + 7 \\=48 +7 \\=55$

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