Using Standard Form

Question 1:

6.6 \times 10^{-5} + 4.2 \times 10^{-3}

4.266 \times 10^{-3}

Question 2:

5.7 \times 10^{-6} - 6.4 \times 10^{-8}

5.636 \times 10^{-6}

Question 3:

5.8 \times 10^{5} \times 1.5 \times 10^{3}

8.7 \times 10^{8}

Question 4:

\frac{2.9 \times 10^{6}}{3.4 \times 10^{6}}

8.53 \times 10^{-1}