50,000 because if it was 55,000 it would be rounded up to 60,000, if it has 5 or more it's rounded up and if it has 4 or less it gets rounded down
When rounding 53,000 to the nearest ten thousand, you look at the digit in the thousands place, which is 3. Since 3 is less than 5, you round down to 50,000. Thus, 53,000 rounded to the nearest ten thousand is 50,000.
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