30.
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When the digit is under 5 you round down but when it is 5 or more you round up. 25 would round to 30.
Since the units part of the number is greater or equal to 5, you round up to 30.
3.14 x 12.52 = 490.625 or round it up to 490.63 millimeters.
25 is approximate to0 to the nearest hundred30 to the nearest ten
To the nearest integer, 25