How many significant digits are there in 0.00003050?

Answer 1

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.

Answer 2

Only 3 significant digits. The zeros before the 3 and the zero after the 5 don't count. Only the 305 are significant.

Answer 3

There are five significant digits in 0.00003050.