0.4 is equal to 4/10, or four tenths. No further rounding is required - it is already rounded down to the nearest tenth.
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.40
To the nearest tenth: 0.4
To the nearest ten: 40 To the nearest one: 36 To the nearest tenth: 36.2 To the nearest hundredth: 36.22 To the nearest thousandth: 36.217
4.4, to the nearest tenth.
It is already rounded to the nearest tenth.