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Here are some follow-up questions for further practice:

1. Convert \( 6.23 \times 10^{-4} \) to expanded form.
2. Express 64000 in scientific notation.
3. How many significant digits are in the number 0.009700?
4. Add \( 7.85 + 0.0031 + 15.42 \), and round according to significant digit rules.
5. Multiply \( 2.5 \times 10^2 \) by \( 3.4 \times 10^{-1} \). How many significant digits should the answer have?

**Tip:** When adding or subtracting, focus on the decimal places, but when multiplying or dividing, pay attention to the number of significant digits!

Practice problems on expanded notation, scientific notation, and significant digits.

Solve practice problems involving expanded notation, converting numbers to scientific notation, and applying significant digits rules for accurate rounding. Suitable for high school students.

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