The number 1.9 is already rounded to one decimal place.
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18.6666 rounded to the nearest zero decimal place would be 19 Warning: Writing 19.0 gives 1 decimal place, so make sure you don't do that!
0.0132
4.4
To round 19.25 to the nearest ones, we look at the digit in the tenths place, which is 2. Since 2 is less than 5, we round down. Therefore, 19.25 rounded to the nearest ones is 19.
19 = 19.0