u just make the number shorter e.g.
1.7 is rounded off to 2
Ten integers can be rounded off to 280. An infinite number of numbers can be rounded off to 280.
999 of them.
Since numbers equal to or greater than 5 are rounded up, and numbers equal to or less than 4 are rounded down, the largest 4-digit number that can be rounded off to 3000 would be 3004.
15 to 24
45 to 54
35 to 44
245 to 254
Infinitely many.
3 499
25549
The numbers from 75 to 84 are rounded off to 80 to the nearest ten
There are infinite amount of numbers that can be rounded to one:0.990.9990.99990.9980.9970.9961.011.051.4999999999, etc.