Answer:
12.000
Explanation:
when rounding to the nearest second you have to look at the numbers that come after the decimal to decide whether to round up or down
if the tenths column is 5 or more round up, if it's less than 5 round down
12.360
look at the tenths column which is 3. It is less than 5 so the number 2 in 12.360 stays the same, and the numbers after the decimals are removed and replaced with 0
final answer : 12.000
if you wanted to correct 12.680 to the nearest second look at the 6 which is in the tenths column. It is 5 or more so the number 2 in 12.680 rounds up to 3 and the numbers after the decimals are replaced with 0
it is rounded to 13.000