0
7: 0.00003050=.0000305
The two zeroes on each end can be taken off because taking them off will NOT change the value of the number.
* * * * *
Not so.
None of the zeros before the 3 are significant - they are only place holders. Conversely, the zero after the 5 IS significant. Its presence indicates a precision that is ten times greater.
So, the significant digits are 3050 - 4 of them.
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