The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
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The answer cannot have more significant figures than any of the components being added or multiplied together.
Measurements need to be specific so we use significant digits.
Any measurement may have two 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.
Out of all the measurements used in the calculation, find the one with the least number of significant digits. This will be the limiting factor of how many significant digits the answer should have.
the precision of the answer must have the same number of significant digits as the measurement with the least significant digits- the site explains the rules and how to identify significant digits