## Rounding off/sig figs during steps of a calculation

Shirley Liu 2I
Posts: 64
Joined: Fri Sep 28, 2018 12:16 am

### Rounding off/sig figs during steps of a calculation

I know we shouldn't round off/apply sig figs until the end of all the steps and calculations of a problem, but what should be done if a value in a step has vinculum/a reoccurring number with the bar over it(e.g. 1.333333...) ? At what decimal point should you round off?

Atul Saha 3D
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

### Re: Rounding off/sig figs during steps of a calculation

Hey Shirley,

I believe that it would be better to simply use the fraction in your calculation to represent the repeating decimal. This would eliminate the rounding in the calculation.

Much Joy,
Atul

Charles Gu 1D
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

### Re: Rounding off/sig figs during steps of a calculation

You should probably round off to the lowest number sig figs that is given in the problem. So if the problem says that there is 4.56 grams of carbon, you should round off to 3 sig figs.

Saleha_Mian_3E
Posts: 32
Joined: Fri Sep 28, 2018 12:25 am

### Re: Rounding off/sig figs during steps of a calculation

I agree with Atul, maybe use a fraction in your calculation. But you could also just keep the repeating numbers to how much your calculator can fit if you are running out of time. Rounding off can make your answer less accurate so it is better to use sig figs at the end.

Bruce Chen 2H
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: Rounding off/sig figs during steps of a calculation

I would suggest using the parenthesis in your calculator to surround the fraction so the number is always exact and never rounded.