The factors of 21 are: 1, 3, 7, 21 | The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40
The GCF is 5.
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
The factors of 21 are: 1, 3, 7, 21 The factors of 23 are: 1, 23
The factors of 21 are: 1, 3, 7, 21 The factors of 51 are: 1, 3, 17, 51
If 21 is a factor of a number, then the factors of 21 must also be factors. So 3 and 7
1
1 and 2
The common factors are: 1, 5.
25
1, 2, 4 and 8
Common factors of 20, 25, and 40 are: 1 and 5.
8 is the greatest common factor while 4 and 2 both are factors
21, 24, 27, 30, 33, 36, 39.
The factors of 18 are:1, 2, 3, 6, 9, 18The factors of 40 are:1, 2, 4, 5, 8, 10, 20, 40
The GCF is: 2
The GCF is 5.
The GCF is: 20