40. versus 40

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samanthaywu
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40. versus 40

Postby samanthaywu » Mon Nov 23, 2020 5:01 pm

40. is 2 sig figs and 40 is 1 sig fig right?

Jagveer 1I
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Re: 40. versus 40

Postby Jagveer 1I » Mon Nov 23, 2020 5:14 pm

Yes, the decimal point makes the first one 2 sig figs and the lack of it makes the second one one sig fig.

Victor Li 2A
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Re: 40. versus 40

Postby Victor Li 2A » Mon Nov 23, 2020 6:23 pm

Here is a useful summary of the sig. fig. rules I found online:

1. All non-zero numbers ARE significant.

2. Zeros between two non-zero digits ARE significant.

3. Leading zeros are NOT significant.

4. Trailing zeros to the right of the decimal ARE significant.

5. Trailing zeros in a whole number with the decimal shown ARE significant.

6. Trailing zeros in a whole number with no decimal shown are NOT significant.


Based on these rules, your answer is correct.

Mariah Disc 2C
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Re: 40. versus 40

Postby Mariah Disc 2C » Mon Nov 23, 2020 6:26 pm

40. has 2 sig figs while 40 only has one.

Annika Tamaki 1E
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Re: 40. versus 40

Postby Annika Tamaki 1E » Mon Nov 23, 2020 6:44 pm

Yes, that's correct! On Lavelle's website, he has a cheat sheet on the rules of sig figs that you might find helpful.

George Hernandez 3I
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Re: 40. versus 40

Postby George Hernandez 3I » Tue Nov 24, 2020 11:52 pm

Trailing zeroes are never significant unless a decimal is present. So yes you are correct since it is for 40.

tholz11
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Re: 40. versus 40

Postby tholz11 » Thu Nov 26, 2020 7:48 pm

Yes. Trailing 0s don't count unless there is a decimal present.

John_Tran_3J
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Re: 40. versus 40

Postby John_Tran_3J » Thu Nov 26, 2020 8:16 pm

I agree with the posts above, the decimal creates another significant figure because of its specific rule.

ShinwooKim_3E
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Re: 40. versus 40

Postby ShinwooKim_3E » Fri Nov 27, 2020 1:45 pm

Except when the 0s in decimals are considered, whole values with 0s are not accounted for as a signifcant figure.

Bella Bursulaya 3G
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Re: 40. versus 40

Postby Bella Bursulaya 3G » Fri Nov 27, 2020 1:52 pm

Yes! When decimals are included, it means that you count everything before and after them. 40.0 would have 3 sig figs, and 40. would have two. 4.0 would also have 2.

SophiaJenny3I
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Re: 40. versus 40

Postby SophiaJenny3I » Fri Nov 27, 2020 3:02 pm

Hi! Here's the link to Dr. Lavelle's sig fig cheat sheet you can find on his website.
https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf

Serena Song 1A
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Re: 40. versus 40

Postby Serena Song 1A » Sun Nov 29, 2020 8:28 pm

Yup! Zeroes at the end of a digit (trailing zeros) are only significant if there is a decimal point present.

Annette Fishman
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Re: 40. versus 40

Postby Annette Fishman » Sun Nov 29, 2020 10:03 pm

40. has 2 sig figs while 40 only has one! All above answers are correct :)

Lauren Mungo 1K
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Re: 40. versus 40

Postby Lauren Mungo 1K » Sun Nov 29, 2020 10:04 pm

Yes. This is because anything to the left of a decimal point is counted as a sig fig while trailing zeros, with no decimals, are not considered significant

Jack Kettering 3D
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Re: 40. versus 40

Postby Jack Kettering 3D » Sun Nov 29, 2020 10:04 pm

Yes, you are correct. Any digit to the left of a decimal is counted towards being a sig dig

Callan Howard
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Re: 40. versus 40

Postby Callan Howard » Sun Nov 29, 2020 10:06 pm

Yes :)

TiffanyBrownfield 2I
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Re: 40. versus 40

Postby TiffanyBrownfield 2I » Sun Nov 29, 2020 11:27 pm

Yes, because the decimal in 40. denotes that the 0 adds to the precision. Because of the lack of decimal in 40, we are unsure if the 0 is precise or not.

Maryeli Garay 2H
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Re: 40. versus 40

Postby Maryeli Garay 2H » Sun Nov 29, 2020 11:28 pm

Yes :) because both digits are in front of the decimal

Dane_Beasley_1E
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Re: 40. versus 40

Postby Dane_Beasley_1E » Sun Nov 29, 2020 11:34 pm

The decimal makes 40. have two sigfigs. Without the decimal it just has one sigfig.

Edward Castro
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Re: 40. versus 40

Postby Edward Castro » Sun Nov 29, 2020 11:35 pm

I agree with the post above. Trailing zeros cannot count unless there is a decimal .

Rose_Malki_3G
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Re: 40. versus 40

Postby Rose_Malki_3G » Sun Nov 29, 2020 11:38 pm

Yes because, without a decimal present, ending zeros are not counted as significant digits

Mina Tadros 3L
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Re: 40. versus 40

Postby Mina Tadros 3L » Sun Nov 29, 2020 11:39 pm

Correct.

Jaclyn Schwartz 1I
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Re: 40. versus 40

Postby Jaclyn Schwartz 1I » Sun Nov 29, 2020 11:39 pm

Yes! 40. has 2 numbers in front of the decimal while 40 is only one sigfig because the zeros after don't count. That summary will be pretty helpful^^

Katie Phan 1K
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Re: 40. versus 40

Postby Katie Phan 1K » Sun Nov 29, 2020 11:40 pm

Victor's summary is good!


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