As a general rule, numbers that are halfway round up.
the higher multiple of ten
Usually the higher hundred.
You Round up to the next higher number
Round up.
As a general rule, numbers that are halfway round up.
the larger multiple
the higher multiple of ten
Usually the higher hundred.
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You Round up to the next higher number
Round up.
600
If a coordinate is half way between a number, eg (2.3,74) then you round to the nearest whole number so it would be (2, 74) (round 2.5 to 3 not to 2, round 2.1 to 2 not 3 and round 2.7 to 3, this is because the number after the decimal place is either closer to one or the other)
I assume in your question you are asking what happens when a number is in between two whole numbers. E.G 4 and 5 the middle is 4.5 If you wanted to round this up to 1 significant figure or an integer/whole number the rule is that if in the middle you always round up to the highest number. In the case of the example the answer would be 5 if you were to round it up.
463 rounded to the nearest hundred would be 500. Normally if a number is past the halfway mark between hundreds (in this case, if it's past 450) you round up. If not, you round down. If your number is exactly at the halfway mark (i.e. 450 exactly) you normally still round up.