The answer is 10.
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10
Rounding to the nearest ten thousands, the number 378,402 becomes 380,000
6.429 rounded to the nearest ten is 10 because 6 is greater than 5
724 rounded to the nearest ten is 720. When rounding a number to the nearest ten, you look at the digit in the ones place. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, the digit in the ones place is 4, so we round down to the nearest ten, which is 720.
To the nearest thousand - 36,000 To the nearest ten thousand - 40,000 Both places are 5 or above so you round up