89.456 should be rounded to 89 (to the nearest whole number) but it should be rounded UP to 90.
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Rounded up to the nearest tens would be 100. Rounded to the nearest tens is 90.
438 rounded up would be 450. 438 rounded down would be 400.
100
Rounded up to the nearest eighth - it would be 3.875
rounded to a whole number it is 1257....rounded just means that if the last number is less then 5 it is rounded down if it is 5 or greater it is rounded up ie 1257.6 it would be 1258