4.2
If you mean 42.0, then it would simply be 42.
Otherwise if you meant 0.42 then the answer would be 0.40, as 4 was in the tenths place and the 2 would round down.
It's already there.
It is 4.2, exactly as in the question.
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
9078
It is 5.2 when rounded to the nearest tenths.
It is then 56.5 when rounded to the nearest tenth
It is 0.8 when rounded to the nearest tenth
10775.9
2.7
42.0
The answer is 1,764.0
42.0
42.3 to the nearest tenth. 42 to the nearest integer 40 to the nearest
It is 5.2 when rounded to the nearest tenths.
65.6
It is then 52.8 when rounded to the nearest tenth
It is then 56.5 when rounded to the nearest tenth
It is 232.4 when rounded to the nearest tenth
It is 12.4 rounded to the nearest tenth
It is 0.8 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth