College Mathematics Lecture Notes, Section 1.3

Always round at the end of calculations. Significant digits. 43,200 has 3 significant digits (Do not count zeros at end of a whole number.) 0.0032 has 2 significant digits (Do not count zeros at the beginning of a decimal.) 4.10 has 3 significant digits (Do count. zeros at the . end of a decimal.) has 4 significant digits (Do count. zeros . in ... ................
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