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 15 are: 1, 3, 5, 15 The factors of 21 are: 1, 3, 7, 21 The factors of 33 are: 1, 3, 11, 33
The factors of 21 are: 1, 3, 7, 21 The factors of 23 are: 1, 23
The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
15: 1,3,5,15 28: 1,2,4,7,14,28 21: 1,3,7,21 35: 1,5,7,35
So with 3 fractions with denominators of 28 21 and 15: 28 = 7 x 4, 21 = 7 x 3, and 15 = 5 x 3. 28 and 21 have 7 in common; 21 and 15 have 3 in common, so those factors are used once: 7 x 4 x 3 x 5 = 420
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 x 3 x 7 x 21.The factors of 28 are 1 x 2 x 4 x 7 x 14 x 28.The GCF of 21 and 28 is 7.
The GCF of 15 and 28 is 1. The factors of 15 are 1, 3, 5, and 15 The factors of 28 are 1, 2, 4, 7, 14, and 28 So the GCF of 15 and 28 is 1
Factors for 84 are {1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84} Factors for 105 are {1, 3, 5, 7, 15, 21, 35, 105} Greatest common factor of 84 and 105 is 21
The factors of 15 are: 1, 3, 5, 15 The factors of 21 are: 1, 3, 7, 21 The factors of 33 are: 1, 3, 11, 33
The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42
The Greatest Common Factor of 15, 21, 28: 1
The factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105
The factors of 21 are: 1, 3, 7, 21 The factors of 23 are: 1, 23
The factors of 15 are 3 and 5. The factors of 21 are 3 and 7. So the common factor is 3.