What is the HCF of 21 and 28?

21∣3 7 ∣7 1 21 = 3 ∗ 7 28∣2 14∣2 7 ∣7 1 28 = 2 2 ∗ 7 H . C . F ( 21 ; 28 ) → 7 ​

Answered by mariamikayla | 2024-06-10

The factors of 21 are 1, 3, 7, and 21 .
The factors of 28 are 1, 2, 4, 7, 14, and 28 .
The factors common to both numbers are 1 and 7 .
The greatest one is *** 7***.

Answered by AL2006 | 2024-06-10

The HCF of 21 and 28 is 7. This can be found using prime factorization or the Euclidean algorithm. Both methods yield the same result: 7 .
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Answered by mariamikayla | 2025-01-25