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The nearest 10 to 340 is 340 itself. When determining the nearest 10, you are looking for the multiple of 10 that is closest to the given number. Since 340 is already a multiple of 10, it is the nearest 10 to itself.
340
340
10.0
Oh, dude, it's like super simple. Numbers that round to 350 to the nearest 10 are those between 345 and 354. So, that's like 10 numbers in total. Easy peasy lemon squeezy.