Well, darling, 617 rounded to the nearest ten is 620. It's not rocket science, just a little math magic. Keep calm and carry on with your rounding adventures!
Oh, dude, 617 rounded to the nearest ten is 620. Like, you just gotta look at that last digit, which is 7, and since it's greater than 5, you round it up. Easy peasy, lemon squeezy.