There are four significant figures in 33050. The trailing zero is not significant because there is no decimal.
There would be five significant figures in 33050. If we were to remove the last zero in the number, we would alter the value of the number. Had the number been 3305.0, then there would have been four significant digits.
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10.1+25.01+5.08
There are 3 significant figures in '4.50g'
4
There are 4 significant digits
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