Explanation:
1) 339.1
2) 615.4
3) 401.9
4) 2210.6
5) 2769.5
all you need to do is see if the numbers (after decimal) right after is bigger or smaller that 5. If it is greater that 5, then you add 1 to the number before it. (Ex: round 17.26 to nearest tenth, 17.3) if it is smaller then 5, it stays the same, you just take off the other number. (Ex: round 17.21 to nearest tenth, 17.2) harder to explain than I thought it would