Using Standard Form

Question 1:

4.3 \times 10^{-6} + 5.7 \times 10^{-4}

5.743 \times 10^{-4}

Question 2:

4.7 \times 10^{5} - 9.5 \times 10^{3}

4.605 \times 10^{5}

Question 3:

9.6 \times 10^{-3} \times 7.9 \times 10^{-5}

7.584 \times 10^{-7}

Question 4:

\frac{1.2 \times 10^{4}}{5 \times 10^{-4}}

2.4 \times 10^{7}