4539684357321 rounded to the nearest billion is 4540000000000. Look to the digit right of the billions, hundred millions. The hundred millions digit is 9. When rounding anything less than five you round down. When rounding anything five or more you round up. 9 is more than five so you round up to 0, making all the digits to the right 0 too.
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It is: 760,000,000,000 which is 760 billions or 7.6*1011 in scientific notation
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
Rounded to nearest 10: 40 Rounded to a whole number: 39 Rounded to one decimal: 39,1 Rounded to two decimals:39,09