The GCF is 3.
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The greatest common factor is 3
The common factors of 21 and 36 are 1 and 3
Factors of 12 - 1, 2, 3, 4, 6, 12. Factors of 15 - 1, 3, 5, 15. Factors of 36 - 1, 2, 3, 4, 6, 9, 12, 18, 36. Common factors are - 1, 3.
Factors for 15: 3, 5 Factors for 36: 2, 3, 4, 6, 9, 12, 18 Highest common Factor: 3
Factors of 15: 1, 3, 5, 15 Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36