680
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684 rounded to the nearest ten is 680. 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 you round down to 680.
Oh, dude, 684 rounded to the nearest ten is 680. Like, you just gotta look at that last digit, which is 4, and be like, "Hey, are you 5 or above?" And since 4 is less than 5, you just bring it down to 0. Easy peasy, lemon squeezy.
Well, honey, 684 rounded to the nearest ten is 680. It's as simple as that, no need to overcomplicate things. Just lop off those pesky little numbers and call it a day.
27,578,684,000 rounded to the nearest tenth of a billion is 27,600,000,000
It is then 740 when rounded to the nearest ten.
260
320
rounded to the nearest ten... it would be 420.