Using Standard Form

Question 1:

1.1 \times 10^{5} + 4.1 \times 10^{4}

1.51 \times 10^{5}

Question 2:

2.8 \times 10^{-3} - 7.2 \times 10^{-5}

2.728 \times 10^{-3}

Question 3:

7.8 \times 10^{5} \times 1.9 \times 10^{6}

1.482 \times 10^{12}

Question 4:

\frac{8.1 \times 10^{-4}}{6.1 \times 10^{-3}}

1.33 \times 10^{-1}