Question

27 54 81 HCF COMMON FACTOR METHOD

Answer 1

Answer:

The factors of 81 are 81, 27, 9, 3, 1. The common factors of 54 and 81 are 27, 9, 3, 1, intersecting the two sets above. In the intersection factors of 54 ∩ factors of 81 the greatest element is 27. Therefore, the greatest common factor of 54 and 81 is 27.

Answer 2

Answer:

HCF of 18, 24 and 42 is 6

Step-by-step explanation:

Let’s find the HCF of 18, 24 and 42.

First find all factors of the given numbers individually.

Factors of 18 = 1, 2, 3, 6, 9, 18

Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24

Factors of 42 = 1, 2, 3, 6, 7, 14, 21, 42

Therefore, common factors of 18, 24 and 42 are 1, 2, 3 and 6. 

HCF of 18, 24 and 42 is 6