State the number of significant figures.

1) 809 Answer : 3

2) 0.0060 Answer : 5?

3) 0.00000095 Answer : 9?

4) 5.60 Answer : 3

5) 5.743 Answer : 4

6) 0.010 Answer : 4?

Physics Help - bobpursley, Sunday, September 11, 2011 at 4:59pm

2, 3, 6 are wrong: Zeroes to the left of significant digits are NOT significant, unless they are between two non zero digits.

---I don't understand. Could you please explain more simply.

2 answers

3.0006 five sig digits.
0.0006 one sig digit.
0.00060 two sig digits.

Reread the rule I quoted you now.
0.0006 one sig digit.
-which digit is significant?
6?

0.00060 two sig digits
60 are significant digits?