999 of them.
Infinitely many.
45 to 54
3 499
85 to 94
999 of them.
Ten integers can be rounded off to 280. An infinite number of numbers can be rounded off to 280.
Infinitely many.
Infinitely many.
35 to 44
245 to 254
45 to 54
3 499
1549
85 to 94
lets see.... 251,252,253,254,249,248,247,246,245, and many others
Nine of them.