How do you round of 306.25?

The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".

When rounding off to the nearest tenth, 306.25 becomes 306.3 (5 is discarded, 2 increases by 1)

When rounding off to the nearest unit (or digit or one), 306.25 becomes 306 (2 and any following numbers are discarded, 6 remains unchanged)

When rounding to the nearest ten, 306.25 becomes 310 (6 and any following numbers are discarded, 0 increases by 1)

When rounding to the nearest hundred, 306.25 becomes 300 (0 and any following numbers are discarded, 3 remains unchanged.