The number is already rounded to the nearest ten.
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505 rounded to the nearest to is 510
645 rounded to the nearest ten would simply be 650.
Count in tens. What are the two tens either side of 509? 500 is smaller and 510 is bigger. Any ten smaller than 500 is going to be further away than 500 Any ten bigger than 510 is going to be further away than 510 So the answer is going to be one of 500 and 510. Now, how far is 500? 509 - 500 = 9 units how far is 510? 510 - 509 = 1 unit So which is the smaller distance? 1 unit to 510. So 510 is the nearest 10.
672 rounded to the nearest ten would be equal to 670.
459 to the nearest ten thousand? (not thousandth?) 459 would round down to 0..