1. Find the product of $(3.2 \times 10^3)$ and $(2.0 \times 10^5)$. Express the answer in scientific notation: ___.
2. What is the product of $(7.0 \times 10^4)$ and $(4.0 \times 10^5)$ expressed in proper scientific notation?
3. Calculate $(3.5 \times 10^7)(5.0 \times 10^2)$ and write the answer in proper scientific notation. ___
4. Find the value of $(4.4 \times 10^8) \times (2.0 \times 10^{-3})$. Write the answer in scientific notation.
5. A student multiplies $(8.0 \times 10^3)$ and $(3.0 \times 10^4)$ and gets an initial result of $24.0 \times 10^7$. What is the final answer in proper scientific notation?
6. The estimated population of a city is 3,450,000. Write this number in scientific notation in the form $a \times 10^n$. The value of $a$ is ___.
7. The width of a very thin wire is 0.000097 meters. When this measurement is written in scientific notation as $9.7 \times 10^n$, what is the value of the integer $n$? ___
8. Which of the following numbers is NOT written in proper scientific notation?
9. The number of stars in a small galaxy is estimated to be 219,000,000. How is this number expressed in scientific notation?
10. A standard sheet of paper has a thickness of approximately $0.0001$ meters. Express this thickness in scientific notation as $1 \times 10^n$. The value of $n$ is ___.