Well, let's take a moment to appreciate the beauty of numbers. If we're looking to round 12.25 to the nearest tenth, we see that the tenths place is 2. So, when we round, 12.25 becomes 12.3. Just a little adjustment to bring out the best in our numbers.
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It is 12.2
Most schools wrongly teach you to always round a half up (so the answer would be 12.3) but, while this is a simple rule to teach, it is not really correct. Under this rule: