The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.
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7500000
7,464,000 rounded to the nearest hundred-thousands is 7,500,000
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