Using Standard Form

Question 1:

3.1 \times 10^{-6} + 2.7 \times 10^{-7}

3.37 \times 10^{-6}

Question 2:

9.7 \times 10^{4} - 4.2 \times 10^{2}

9.658 \times 10^{4}

Question 3:

5.9 \times 10^{-4} \times 3.6 \times 10^{6}

2.124 \times 10^{3}

Question 4:

\frac{3.7 \times 10^{-4}}{7.1 \times 10^{-5}}

5.21 \times 10^{0}