It can be. 18 is a proper factor of 36.
Yes 18 times 2 equals 36 It is a factor, not a [proper] multiple.
2, 3, 6 and 9
2, 3, 6, 9, 18, 27
a proper factor is a factor.
2, 3, 4, 6, 9, 12, 18
2, 3, 4, 6, 9, 12, 18
No. Prime numbers don't have proper factors.
It can be. 24 is a proper factor of 48.
It can be. 25 is a proper factor of 50.
It can be. 42 is a proper factor of 84.
It depends on the number being factored. 22 is a proper factor of 44. 22 is a factor, but not a proper factor, of 22.
2, 3, 4, 6, 8, 9, 12, 18, 24, 36