What is the highest common factor of 35 49 and 91?

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.