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| Prime Factorization of 60: | 2 x 2 x 3 x 5 |
| Prime Factorization of 90: | 2 x 3 x 3 x 5 |
| Common Prime Factors: | 2 x 3 x 5 = 30 |
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| Factors of 60: | 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 |
| Factors of 90: | 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 |
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| Greatest Common Factor: | 30 |