Scientific Notation and Large Numbers

Help me master scientific notation:

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Context: ${{CONTEXT}} (astronomy, chemistry, biology)
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Cover:
1. What is scientific notation
2. Converting to scientific notation
3. Converting from scientific notation
4. Comparing numbers
5. Adding and subtracting
6. Multiplying and dividing
7. Calculator usage
8. Significant figures connection
9. Order of magnitude
10. Real-world applications
11. Practice problems
12. Common errors
13. Quick estimation