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  1. Dec 2021
  2. chem.libretexts.org chem.libretexts.org
    2.5: Measured Numbers and Significant Digits
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    1. Wang.Wendi 09 Dec 2021
      Starting with the first nonzero digit on the left, count this digit and all remaining digits to the right. This is the number of significant figures in the measurement unless the last digit is a trailing zero lying to the left of the decimal point.

      I think using arrows and explanations as pictures would surely make audience clearer about this rule. Words and pictures are two well-associated modes here.

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    chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/Chem_1300:_Preparatory_Chemistry/Learning_Modules/02:_Mathematical_Fundamentals/2.05:_Measured_Numbers_and_Significant_Digits