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Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoAny time you see two numbers and one is a factor of the other, the smaller number is automatically the GCF of the problem. Any time you see two prime numbers, the GCF is automatically 1.
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