Using Standard Form

Question 1:

4.6 \times 10^{-4} + 9.8 \times 10^{-6}

4.698 \times 10^{-4}

Question 2:

5.5 \times 10^{4} - 6 \times 10^{3}

4.9 \times 10^{4}

Question 3:

1.4 \times 10^{-3} \times 8 \times 10^{-4}

1.12 \times 10^{-6}

Question 4:

\frac{9.9 \times 10^{-6}}{8.9 \times 10^{-3}}

1.11 \times 10^{-3}