Rounding: when and where?

[Fenared Ortiz 3K]

So I am aware of the sig fig rules, but i am having trouble trying to figure out when to round and when to just do the cut off method. For example when i got an answer for a square root i got .000189737, and the answer was 1.89x10^-4. I was wondering if we put 1.90x10^-4 would be marked as wrong.

[Alex Nechaev 1I]

It wouldn't be wrong to round up, since I'm pretty sure the rounding rules still apply to sig figs. Both would probably be acceptable.

[204917020]

It wouldn't be marked as wrong because rounding rules still apply with sig figs. As long as you didn't round earlier in the problem, it's okay to round your final answer while still following the sig fig rules.

[Jonathan Marcial Dis 1K]

When you're rounding you just have to stay constant. For instance, if I round my very first solution to the 3rd decimal place, round the rest of your solutions to the 3rd decimal place.

[yazminedesan1F]

usually I round to however many numbers are in the question.

[SamanthaGrohe1B]

during AP Chem in high school, we were recommended to round to the smallest number of sigfigs presented in the question

[Allen Chen 1J]

If that was the exact value, then rounding up wouldn't be considered wrong since 7 is above or equal to 5 and therefore is rounded up

[Tiffany Tufenkjian 1E]

I usually don't round until I get my final answer.

[Chem_Mod]

The correct thing to do is not to round until the end of all mathematical operation.

[Salena Chowdri 1I]

As mentioned above, don't round off until the final answer. Your answer would not be marked as wrong but maybe to be safe in parenthesis mention that number of sig figs you've rounded to. However, the general rule is round off to the lowest number of sig figs given in the question asked.

[Maria Zamarripa 1L]

When: at the end of solving the problem.