There are 900 three-digit numbers.
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Three - all nonzero digits are significant.
Just one, the first 5. * * * * * No. All three digits are significant.
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 three significant digits. I am not sure what scientific digits are!
0.00909 has three significant digits.