12
The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. The factors of 70 are 1, 2, 5, 7, 10, 14, 35 and 70. so the common factors of 24 and 70 are 1 and 2.
The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70
The factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70 The GCF of 60 and 72 is 12.
The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70 The factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70.
70 has 8 factors; 1,2,5,7,10,14,35 and 70.
The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24 The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70 The common factors are: 1, 2
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
66
The factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70
The factors that both 60 and 70 have are 1, 2, 5, and 10. All of these are also factors of 10. So, there is not a number that is a factor of 60 and 100 but is not a factor of 100.