Apart from 1, the only positive integer common factor of 49, 84, and 91 is 7.
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The highest common factor (HCF) of 35, 49, and 91 can be found by identifying the prime factors of each number. The prime factors of 35 are 5 and 7, of 49 are 7 and 7, and of 91 are 7 and 13. To find the HCF, we identify the common prime factors among the numbers, which in this case is 7. Therefore, the HCF of 35, 49, and 91 is 7.
The GCF is 7.
The multiples of 7 up to 100 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91 and 98
The factors of 78 are: 1, 2, 3, 6, 13, 26, 39, 78 The factors of 91 are: 1, 7, 13, 91 The factors of 156 are: 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156 The common factors are: 1, 13 The Greatest Common Factor: GCF = 13
The GCF is 7.