lets see.... 251,252,253,254,249,248,247,246,245, and many others
999 of them.
250 and 349
Ten integers can be rounded off to 280. An infinite number of numbers can be rounded off to 280.
Infinitely many.
Infinitely many.
45 to 54
35 to 44
85 to 94
3 499
99 of them.
Nine of them.