Ten whole numbers round to 50, if you include 50 itself which requires no rounding.
Three.
how many numbers round to 300
There are an infinite list of different numbers, but only 90 of them are integers (whole numbers).
55
999 are whole.
An infinite number.
1000 numbers. From 19,500 to 20,499 all round to 20,000
430
Three.
Infinite
how many numbers round to 300
All of them. Different numbers have different numbers of factors.
There are an infinite list of different numbers, but only 90 of them are integers (whole numbers).
500
1,2,4,8,16, so 5
Four of them.
55