## Thinking Mathematically (6th Edition)

$9_{\text{ten}}=13_{\text{six}}$
Note that: $(1 \times 6)+ (3 \times 1) = (1 \times 6^1) + (3 \times 1)$ For base 6, recall that: $(1 \times 6^1 + (3 \times 1)=13_{\text{six}}$ Thus, $9_{\text{ten}}=13_{\text{six}}$