You would round to 0.12, What you would do is look at the placement of each number. The 1 is in the tenths place, the 2 is in the hundreds and the 3 is in the thousands. So you look at the three and see if you would round up or down, if it is 5 or greater you round up if it is 4 or less then round down. This is less so you would round down to 0.12