What is the highest common factor of 28 63 and 91?

Answer 1

28 = 2 x 2 x 7

63 = 3 x 3 x 7

91 = 7 x 13

7 is the only common factor so is the highest common factor

Answer 2

The highest common factor (HCF) of 28, 63, and 91 is the largest number that divides all three numbers without leaving a remainder. To find the HCF, you can first find the prime factors of each number: 28 = 2^2 * 7, 63 = 3^2 * 7, and 91 = 7 * 13. Then, identify the common prime factors among the three numbers, which in this case is 7. Therefore, the HCF of 28, 63, and 91 is 7.