Depends if you 're rounding up to the nearest hundred, tens, units or 100ths etc... It is not possible to tell you without knowing what unit you wish to round it up with respect to.
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Oh, dude, 452 to the nearest 100 is 500. You just round up because 452 is closer to 500 than it is to 400. It's like, not rocket science, man.
452/1000
452, exactly as in the question.
Radius squared times pi 12X12=144X3.14=452.16 452 sq. ft.
CDLII = 452.