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The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
5. Count the number of digits from the first non-zero digit to the last non-zero digit.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
All numbers which are not "zero" are classed as significant digits. Therefore in the number 129 there will be three digits which are classed as significant.
The number 202.45 has five significant digits.