There are infinitely many such numbers.
800
All numbers can be rounded to the nearest ten.
999 of them.
70
88500
There are infinitely many such numbers.
500
800
21079000000 rounded to the nearest hundred thousand is 21079000000
There aren't any numbers that round to 350 to the nearest hundred.
98600
7464000 tons rounded to the nearest hundred thousand would be 7500000 metric tons.
All numbers can be rounded to the nearest ten.
600
An infinite number.
530