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Significant Figures
Digits with known certainty and the first uncertain or estimated digit.
Scientific Notation
If the measurement is in scientific notation, all given digits are significant.
Standard Notation Rules
Addition and Subtraction
Only concerned with the number of decimal places. The significant figures are controlled by the measurement with the fewest decimal places.
Multiplication and Division
The answer must have the same number of significant figures as the measurement with the fewest significant figures.