18.121 rounded to the nearest tenth is 18.1. This is because the digit in the hundredths place is 2, which is less than 5, so the tenths place remains the same. The digit in the tenths place, 1, does not change as a result of rounding.
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It is 0.8 when rounded to the nearest tenth
It is then 56.5 when rounded to the nearest tenth
2.7
28.6
10775.9