A number that is already rounded.
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The number cannot be 64 when rounded to 1 sf.
Ten integers can be rounded off to 280. An infinite number of numbers can be rounded off to 280.
The largest 4 digit number that can be rounded off to 3000 is 3499. If 3499 is rounded to nearest thousand then we get 3000 but if we consider a number greater than 3499 then rounding off yields 4000. So, 3499 is the required number.
The answer depends on the extent to which the number is to be rounded.
It is: 3450