Bill is correct. Jill is incorrect. Jill's error is that she didn't take into account the 9 in the thousands place, so she didn't round the 3 in the ten-thousands place up to a 4, like Bill did.
**Bill is correct ** ;
Jill is correct; when rounding 2,639,456 to the nearest ten-thousand, the correct answer is 2,630,000. This is because the digit in the thousand place is 3, which is less than 5, so we round down. Bill mistakenly rounded up to 2,640,000.
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