Which of these two is correct? "I rounded all the numbers for my calculations" or "I rounded all numbers for my calculations".
Or is there a better way to say that I rounded the results of my calculations.
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Using "the numbers," suggests that you rounded a specific set of numbers that encompasses any numbers used in your calculation.
Omitting the "the," suggests that you first rounded all numbers, into infinity (or the assumed feasible maximum/minimum necessary for the calculation) then did you calculation with whichever numbers you needed from that pre-rounded set.
Obviously omitting the "the," results in an implication that is unlikely to be true, and would actually be a pretty massive waste of effort on the part of the person performing the calculation.
If you rounded the result of the calculation, and not the numbers used to find that result, you would say something entirely different. "The result of the calculation was then rounded to the nearest hundred," would be ideal if you rounded to the nearest hundred.
To say that the results of your calculation were rounded
All my calculations were rounded (to the nearest 10)
All my results were rounded
In your examples
I rounded all the numbers for my calculations
can be understood to mean the inputs were rounded, not necessarily the results (even though there is an implied significance level for the result depending on the number of rounded digits)
I rounded all numbers for my calculations
all numbers for my calculations were rounded
can be understood to mean the inputs and the results were rounded.
I believe that "I rounded all the numbers" sounds better, as in here "the numbers" seems to directly refer to "the calculations" done later. "Numbers" alone, as the people have noted above, implies the set of all numbers and does not strictly refer to what is mentioned. However I can see both as valid in everyday usage.
(Not a linguist, but I hope it helps!)