# Topic 6: Scientific Notation

Try the problem below. After you try the problem, you can watch a video to see a correct solution.
Express the product of $$\left({ 3 \times 10^{-2} }\right)\left( { 4 \times 10 ^ 5 }\right)$$ in scientific notation.
 A $$\displaystyle{12.0\times 10^3}$$ B $$\displaystyle{1.2\times 10^{-10}}$$ C $$\displaystyle{12\times 10^{-10}}$$ D $$\displaystyle{1.2\times 10^{2}}$$ E $$\displaystyle{1.2\times 10^4}$$

After watching the video, try this problem to practice more.

Express the product of $$2\times 10^7$$ and $$9\times 10^{-3}$$ in scientific notation.
 A $$\displaystyle{18\times 10^{4}}$$ B $$\displaystyle{18\times 10^{-21}}$$ C $$\displaystyle{1.8\times 10^{-21}}$$ D $$\displaystyle{1.8\times 10^{5}}$$ E $$\displaystyle{1.8\times 10^{4}}$$