4.0
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Well, let's take a moment to appreciate the beauty of rounding numbers. When we look at 3.96, we see that the second decimal place is a 6, which means we round up. So, 3.96 rounded to the nearest tenth is 4.
To round 3.96 to the nearest tenth, we look at the digit in the hundredths place, which is 9. Since 9 is greater than or equal to 5, we round up. Therefore, 3.96 rounded to the nearest tenth is 4.0.