The rules of Significant Figures (or Digits) with several examples and a common mistake. Also a few Scientific Notation Examples.
0:19 Defining Significant Figures
1:13 The Rules of Significant Figures
1:28 First Example
1:54 Second Example
2:39 Third Example
3:10 Many More Examples
4:47 Scientific Notation and Significant Digits
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Rounding and Working with Significant Figures in Physics