Assuming whole numbers:
If rounding to the nearest 10, it would be 3004
If rounding to the nearest 50, it would be 3024
As "to the nearest whatever" increases, so the greatest number also increases.
So the greatest "whatever to round to" to produce 3000 must be 3000, that is the question becomes:
What is the greatest number that rounds to 3000 to the nearest 3000?
Half of 3000 is 1500, so the greatest whole number that rounds to 3000 is 3000 + 1500 - 1 = 4499 (since 3000 + 1500 = 4500 would round up to 6000).
Any number such that 1500 ≤ number < 4500 will round to 3000 to the nearest 3000.
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which number will round up to 26000
35
The greatest number to round off 80,000 depends on the level of precision required. If rounding to the nearest ten thousand, the greatest number would be 90,000. If rounding to the nearest thousand, the greatest number would be 81,000. If rounding to the nearest hundred, the greatest number would be 80,100.
It depends on what basis you use for rounding. If you round to the nearest thousand, then 86,499.99999... is the largest possible number. If you round to the nearest multiple of 86,000, then 128,999.999... would be the largest number.
A six-digit number will round to the nearest hundred thousand. Since the number in the ten thousands place is less than 5 (the number is less than 750,000) round down. 737,121 rounds off to 700,000.