Using Standard Form

Question 1:

1.5 \times 10^{3} + 7.1 \times 10^{1}

1.571 \times 10^{3}

Question 2:

2.4 \times 10^{-5} - 7.1 \times 10^{-7}

2.329 \times 10^{-5}

Question 3:

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

1.4 \times 10^{-8}

Question 4:

\frac{1.8 \times 10^{5}}{4 \times 10^{-3}}

4.5 \times 10^{7}