What is the highest common factor of 210 and 450?

The factors of 210 are: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210

The factors of 450 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 25, 30, 45, 50, 75, 90, 150, 225, 450

The common factors are: 1, 2, 3, 5, 6, 10, 15, 30

The Greatest Common Factor (GCF) is: 30

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