It is important to consider the precision of the measuring equipment.
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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.
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.
All five digits in the number are significant.
The number 202.45 has five significant digits.
When using significant digits, the product has only the number of significant digits as the lowest number in the factors. "20" has two significant digits and "310" has three. Therefore, the product has to have two significant digits. 310 × 20 = 6200 6200 already has two significant digits.