25.12 rounded to one decimal number is 25.1
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It is: 3.5 rounded to one decimal place
The number 3.5 is already rounded to one decimal place.
Rounding a number to one decimal place means rounding it to one number after the decimal point (dot/period). The first number after the decimal point is a 4. To determine if it should be rounded up you look at the second number after the decimal with is also a 4. If it were a five or greater you would round up, but it's not so you don't. Thus 2.447 rounded to one decimal place is 2.4
12.6
It is already rounded to exactly that degree.