Oh, dude, to round to the nearest ten thousand, you just look at the digit in the ten thousand's place. So, any number between 515000 and 524999 would round to 520000. It's like, not rocket science, man.
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Any number from 515,000 to 524,999 would round to 520,000 when rounded to the nearest ten thousand. So, technically speaking, there are 10,000 numbers that would round to 520,000. Math can be a real party pooper sometimes, huh?
When rounding to the nearest ten thousand half round up and half round down. Thus 10,000 ÷ 2 = 5,000 numbers either side of 520,000 round to it, ie 520,000 ± 5,000. However, as numbers exactly halfway round up:
Thus any number greater than or equal to 515,000 and less than 525,000 round to 520,000 to the nearest ten thousand.