3.
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12,300 has 3 significant figures.
3 significant figures.
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.
There are 2 significant digits: 5 and 4
There are 5 significant digits in number 14500. To count for a given number as to how many significant digits does it have, look for the first zero form left and decimal point. For ex sample 0045 has 2 significant digits 0.0045 has 2 significant digits 0.4500 has 4 significant digits.