fat label addition = left over fat

[tj_muller]

I was looking at the back of an oatmeal bar box today and the fat read like this
Total fat - 4
Sat fat - 1
Trans - 0
Ploy - 1
Mono - 1

1 + 1 + 1 = 3, so how does this add to 4? Do they round? Could maybe the ploy, for example, really be <1 but not quite 1.5?

[Anthony]

Yes, they round.

[tigo]

yea those 1gs could all be like 1-1.49 gs and the 0g could be anywhere from 0-0.49 g