## Thinking Mathematically (6th Edition)

$3.07 \times 10^{8}$
1 million is $10^6$. Therefore, $307$ million is: $\\= 307 \times 10^6 \\=(3.07 \times 10^2) \times 10^6 \\=3.07 \times 10^{2+6} \\=3.07 \times 10^{8}$