When rounding 6400 to the nearest ten, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we round down. Therefore, 6400 rounded to the nearest ten is 6400.
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Well, darling, 6400 rounded to the nearest hundred is 6400. If you want it rounded to the nearest thousand, it's still 6000. So, there you have it, no need to overcomplicate things.