## Thinking Mathematically (6th Edition)

$731$
The initial work shows that: $473 = (7 \times 64) + (3 \times 8)+(1 \times 1)$ Writing 64 and 8 in base 8 gives: $473 = (7 \times 8^2) + (3 \times 8^1) + (1 \times 1) \\473 = 731_{\text{eight}}$ Thus, $473_{\text{ten}}=731_{\text{eight}}$ Therefore, the missing expression in the given statement us $731$.