how many significant figures are in the following:

4001.006
0.0000456
10001.00000
10.000000456
2000000
2000000.0
20000000000.00
20

3 answers

Here is a good site for s.f.
http://members.aol.com/profchm/sig_fig.html
can u just help me with liek two?
its hard
4001.006
0.0000456


s.f. = significant figure or significant digit.
Zeros between digits count as s.f. and digits are s.f.; therefore, this number has 7 s.f.
The second one is a different kind. Leading zeros don't count as s.f.; therefore, this one has only 3 s.f.
Read that site I give you. It explains s.f. VERY WELL. And it isn't hard but you must follow the rules.