This video tutorial provides a fast review on significant figures. It explains how to count the number of significant figures by identifying nonzero digits, trailing zeros, in between zeros, and leading zeros. It also explains how to round a number to the appropriate number of sig figs when adding or subtracting and when multiplying or dividing.
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More Examples on Significant Figures:
https://www.youtube.com/watch?v=9WFxkxFXb20&t=1s
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