Question

find the HCF of 30 ,60, 90 and 105​

Answer 1

15 is HCF

.................

Answer 2

HCF = Highest Common Factor

Factor of 30 - 1, 2, 3, 5, 6, 10, 15

Factor of 60 - 1, 2, 3, 5, 6, 10, 12

Factor of 90 - 1, 2, 3, 5, 9, 10, 15

Factors of 105 - 1, 3, 5, 7, 15

Common among all - 3 × 5 = 15

∴ HCF of 30, 60, 90, 105 is 15