There are only 999 three digit whole numbers.
102 = 100 which is the first possible three digit number that is a perfect square. 312 = 961 which is the last possible three digit number that is a perfect square. So there are 22 three digit positive numbers that are perfect squares.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
There are 900 three digit numbers. (99 - 1000) (# of possible numbers in the first position = 9) (# of possible numbers in the second position = 10) (# of possible numbers in the third position = 10) 9 *10 *10 = 900
None. The only way for it to be possible would be 3 zeros which is not considered a 3 digit numbers.
30,25,15,20, or 10.
21
21.
5
There are five such numbers.
A lot
There are only 999 three digit whole numbers.
There are no three didgit numbers but there are 63 three digit numbers.
171
There are 900 three-digit numbers.
300300300300
2,4,6,8,10,12,14,16,18