The convention is that at a fraction of .5 or greater you round up. 4.5 is rounded to 5.
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Yes, if you are rounding to the nearest ten. No, if you are rounding to the nearest whole number.
0.62 is approximate to0 to the nearest ten1 to the nearest whole number/unit0.6 to the nearest tenth
49 lowest no. 45
45 to 54
0.45 should be rounded down to 0.