Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the nearest tens and the nearest ones respectively. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
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You can't round off this number in the nearest ten thousand simply because looking at this number it's only on the hundreds place.
round to the nearest ten thousandth 44.24862486
96 round to the nearest ten=100
300
645 rounded to the nearest ten would simply be 650.