3.89 rounds to 3.9
This is because if you see the 8 and you have to round to nearest tenth you would see the hundredths place and see if it is greater than or less than 5. If it isles she than it would stay 3.8 but if it is greater than 5 it would be 3.9.
3.89 rounded to the nearest tenth is 3.9
You go to the tenths place which is 8, and then go to the number next to it. 9 is greater than 5, so you have to round up.
You regroup and get 3.9
3.9
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