Sig Figs, If I have 12,540 for my answer and need to reduce it to 3 sigs figs how do I do that?

Question

the problem was convert 3.0 times 10 to the 3rd calories and find joules?

Answer 1

1.25 * 10^4

Answer 2

well 12,540 in 3 sig figs would be 1.25 x 10^4. or 12,500

Answer 3

12500

take the first 3 numbers...being 'significant', then round off the number. ( if it was 12550 if would have been 12600 reduced to 3 sig. figures)

Answer 4

1.25 x 10^4

Answer 5

12,500
The trailing zeros do not count.

Answer 6

12500