Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the second greatest place. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
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100
The greatest number rounded to 600,000 would be 649,999. When rounding to the nearest hundred thousand, any number equal to or greater than 650,000 would round up to 700,000. Therefore, the greatest number that would round down to 600,000 is 649,999.
250 to 349
3000
549999