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the rule states that if there is an Absence of a decimal point, you start counting from the right side of the number, and if there is a Presence of a decimal point you start counting from the left side of the number to determine how many significant figures there are overall.
If there's a decimal point, start counting digits from the left starting with the first non-zero digit. If there isn't a decimal point, start counting digits from the right side starting with the first non-zero digit. Just think of a map: Pacific = left, Atlantic = right.
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