## rounding [ENDORSED]

kimberlysanchez-1E
Posts: 30
Joined: Tue Nov 14, 2017 3:01 am

### rounding

can i round 2.8 to 3?

Posts: 30
Joined: Fri Apr 06, 2018 11:03 am
Been upvoted: 1 time

### Re: rounding

Rounding for answers depends on the individual problem and its significant figures in the question. If the question has only 1 sig fig than rounding to 3 is fine but it it has 2 sig figs than you should leave it as 2.8

Toru Fiberesima 1L
Posts: 63
Joined: Fri Apr 06, 2018 11:02 am

### Re: rounding

you should always use the number of sig figs of the number with the lowest number of sig figs in the question and subsequent calculations

Angelica Garcia 1-H
Posts: 9
Joined: Fri Apr 06, 2018 11:02 am

### Re: rounding  [ENDORSED]

retweet

Brian Chang 2H
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Re: rounding

always use the number of sig figs of the number with the lowest number of sig figs in the question and subsequent calculations

The number of sig figs will be determined by the number with the lowest sig figs in the equation. Eg. 3.28 + 1.5 = 4.8. (2 sig figs cause of 1.5) But, when dealing with more 3 sig figs is usually a safe bet!

Christine Chow 4G
Posts: 43
Joined: Fri Sep 28, 2018 12:28 am

### Re: rounding

There are different rules for sig figs for when you multiply/divide versus adding/subtracting. For multiplying/dividing you count which number has the least amount of sig figs and use that amount in your answers. For adding/subtracting, you use the number with the least decimal places to determine which decimal place to round in your answer. I just thought this would be helpful since I totally forgot how to use sig figs the first day of class.

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

### Re: rounding

I don't know how to post a question, but related to this topic of rounding:

if your emperical ratio is 1:6.012 can your final answer be for example C1H6 or does it have to be to the next nearest whole number of 5 and 30? Could that work?

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

### Re: rounding

Also, would someone let me know how to post a question? I couldn't figure out how and I've tried reading the FAQs

Christine Chow 4G
Posts: 43
Joined: Fri Sep 28, 2018 12:28 am

### Re: rounding

You can round the 6.01 to 6. I would say if it isn't more than 0.1 off of a whole number, then you should round but i dont know if there's a rule for this.

Kaylee Kang 1G
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

### Re: rounding

Veronica Soliman 4B wrote:Also, would someone let me know how to post a question? I couldn't figure out how and I've tried reading the FAQs

If you click on one of the forum topics, there should be a button under the title that says "New Topic" where you can create a new post!

Isabel Nakoud 4D
Posts: 101
Joined: Fri Sep 28, 2018 12:27 am

### Re: rounding

If this is regarding stoichiometric coefficients, I would say that rounding is a jump and 2.9 would be better. Trial and error multiplication until you get a whole number can give you a better idea if theres a whole number to be achieved somehow, or by turning the decimal into a fraction and multiplying the denomatinor to all the coefficients!