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No, exact quantities are not considered when applying significant figure rules. Exact quantities are known with complete certainty and do not impact the uncertainty associated with measured quantities. Significant figures are only counted based on measured values.
The significant figure for 20kg is 2, as the trailing zero(s) after the whole number are not considered significant in this case.
Two significant figures. The numbers 8 and 6 are both considered significant figures.
0.02 has two significant figures. The leading zero is not significant in this case as it is considered a placeholder.
6276 as a significant figure would be 4 significant figures.
There are four significant figures in 625,000. The zeros in the middle of the number are considered significant because they help pinpoint the magnitude of the number.