Using Standard Form

Question 1:

1.1 \times 10^{-6} + 4.8 \times 10^{-4}

4.811 \times 10^{-4}

Question 2:

9 \times 10^{-4} - 6.3 \times 10^{-5}

8.37 \times 10^{-4}

Question 3:

4.7 \times 10^{-6} \times 5.4 \times 10^{-6}

2.538 \times 10^{-11}

Question 4:

\frac{8.4 \times 10^{5}}{2.2 \times 10^{6}}

3.82 \times 10^{-1}