20 is already rounded to the nearest tens.
3,681 to the nearest tens place is 3,680
508 to the nearest tens = 510
56,999 to the nearest tens is 57,000
403 to the nearest tens = 400
58 to the nearest tens is 60.
4,368,498 to the nearest tens = 4,368,500
Oh, dude, 1125 to the nearest tens is 1130. You know, because you just gotta look at that last digit, which is 5, and if it's 5 or more, you round up. It's like math, but with a sprinkle of laziness.
3,589.996 to the nearest tens is 3,590
392 to the nearest tens = 390
248 to the nearest tens is 250
145 to the nearest tens = 150
429 to the nearest tens = 430
82 to the nearest tens = 80
85 to the nearest tens is 90.
46,434,482 to the nearest tens = 46,434,480
51 to the nearest tens is 50.