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7.5 \times 10^6 multiplied by 3 \times 10^2 is the same as 7.5 \times 3 \times 10^6 \times 10^2
7.5 \times 10^6 divided by 3 \times 10^2 is the same as \frac{7.5 \times 10^6}{3 \times 10^2} which is the same as \frac{7.5}{3} \times \frac{10^6}{10^2}
Work with numbers big and small to estimate and calculate various quantities in physical contexts.