This cannot be correctly answered because you did not say what place to round it to.
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4200
The digit in the tens position is a 4, so we round down to get 4200 as the result.
6.6273 rounded to the nearest thousandths is 6.627 Rounded to the nearest hundredths, it is 6.63. Rounded to the nearest tenths, it it 6.6. Rounded to the nearest ones, it is 7.
16 is rounded to 20 if rounded to the ten's digit.
But rounded to what because if it's rounded to the nearest 10 it then is 13240