47.2
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If a digit has a value of 5 or more then it adds 1 to the column to the left when rounding up. If the digit has a value of 4 or less it is discarded completely. So...
47.234 becomes 47.23 to the nearest 100th which then becomes 47.2 to the nearest 10th.
It is 232.4 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth
61.52 rounded to nearest tenth = 61.5
33.8
45.1