25
Any number is a factor and a multiple of itself. Other factors are less than the number, other multiples are more. 5 is a factor of 10. 10 is a multiple of 5.
Any factor of the number less than the number itself.
6
9 is.
144
Any multiple of 10.
No factors of 5 and 9 are greater than 5 and 9, respectively. 90 is a multiple of 5 and 9 in that range.
64 is not a factor of 8.Factor of a number x is always less than or equal to x.
The factors of 11 are 1 and 11. Neither is one more than a multiple of 6.
30, 60 or 90
20
80 has 5 factor pairs.