31.3
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To round 31.30 to the nearest tenth, we look at the hundredth place, which is 0 in this case. Since 0 is less than 5, we keep the tenths place as it is. Therefore, 31.30 rounded to the nearest tenth is 31.3.
The number 31.3 (no trailing zero is necessary unless referring to a unit of decimal currency) is already rounded to the nearest tenth.