Using Standard Form

Question 1:

4.7 \times 10^{6} + 4.3 \times 10^{4}

4.743 \times 10^{6}

Question 2:

1.9 \times 10^{5} - 3.8 \times 10^{3}

1.862 \times 10^{5}

Question 3:

4.9 \times 10^{-6} \times 1.7 \times 10^{5}

8.33 \times 10^{-1}

Question 4:

\frac{4.3 \times 10^{6}}{8.1 \times 10^{-5}}

5.31 \times 10^{10}