## Sig Fig zero rules

charlotte_jacobs_4I
Posts: 63
Joined: Fri Sep 28, 2018 12:29 am

### Sig Fig zero rules

Hello! i am having some trouble remembering how sig figs work with zeros. For example how many sig figs are in 570, 500, 4.0, 40.0, .04, 0.04, .40, .0040? if anyone could help me out with this that would be greatly appreciated. Also if there are any other tricks for knowing how many sig figs there are please let me know!! Thank you!

Reva Kakaria 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am
Been upvoted: 1 time

### Re: Sig Fig zero rules

Hi! The rules of sig figs are:
1. All non-zero digits are significant
2. Any zeros in between two non-zero numbers are significant
3. A zero at the end of a number without a decimal point is not significant
4. Any zeros at the beginning of a number are not significant
5. Final/trailing zeros in a number with a decimal point are significant

So in the examples you gave, 570 has 2 sig figs, 500 has 1, 4.0 has 2, 40.0 has 3, .04 has 1, 0.04 has 1, and .0040 has 2. I hope this helps!

Chloe Likwong 2K
Posts: 70
Joined: Fri Sep 28, 2018 12:23 am

### Re: Sig Fig zero rules

With values that end in zero but has a decimal point after it, you consider those zeros as Significant Figures.

For example, 500. and 4350. has 3 and 4 Significant Figures respectively.

Hope that helps!

If you do have questions regarding subtraction/addition and multiplication/division rules, just visit: https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf

Good luck!

Daniel Chang 3I
Posts: 33
Joined: Fri Sep 28, 2018 12:23 am

### Re: Sig Fig zero rules

Zeros in front of a non-zero number after a decimal point is not counted as a significant figure but the zeros after a decimal point count as a significant figure.

megan blatt 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

### Re: Sig Fig zero rules

In simple terms, the significant figures are all the numbers, including zeros, that follow the first non zero digit. The exception to that statement is a number like 70 or 200, which only has one significant figure unless specified with a period after the zero (70. or 200.) You would then include the zeros as significant figures.

Nicolette_Canlian_2L
Posts: 77
Joined: Fri Sep 28, 2018 12:25 am
Been upvoted: 1 time

### Re: Sig Fig zero rules

and just another sig fig rule is that if the decimal is 0.405, you would round your answer to 0.400 when needing 3 sig figs. When the last digit ends in five, would want to round the digit prior to it to the nearest even number.

Tinisha 1G
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

### Re: Sig Fig zero rules

Pay attention to decimal points! Those indicate whether you count the zeros as significant figures in some cases.
For example 5000 has one significant figure, but 5000. has 4 significant figures!

I hope this helps!

Kristy 1F
Posts: 31
Joined: Fri Sep 28, 2018 12:19 am

### Re: Sig Fig zero rules

All non-zero digits are significant
Zeros between non-zero digits are significant