2.51 rounded to one decimal place is 2.5
Round to one decimal place just means round to one number after the decimal.
Typical rounding rules are if the number to the right is five or higher, than you increase the digit you are rounding by one. If it is four or lower, than you just keep the number the same.
Examples: Round the following numbers to one decimal place:
In this case, rounding 2.51 to one decimal place gives us:2.5, because the one is less than or equal to five.
The answer is 2.5.
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It already is rounded to one decimal place.
To get the decimal, divide the numerator of the fraction by the denominator. If the decimal runs to more than one place, then you have to round it to one decimal place.
To one decimal place it is rounded to 0.9
4.50 = 4.5 to one decimal place by removing the 0
0.6 is at one decimal place, so no change is needed.