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To find the GCF of two numbers, you must first express them as their prime factors. In this case, that would be:
85 = 5x17
70 = 2x5x7
The next step would be to identify any common factors. In this case the only common factor is 5. Thus, the GCF of 85 and 70 is 5.
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850 is not the greatest common factor of 85 and 10. The person answering the question about the numbers with 850 as the greatest common factor was apparently thinking about the factors of 850 itself, not numbers that would have 850 as their greatest common factor. The greatest common factor of 10 and 85 is 5. The least common multiple of 10 and 85 is 170. The product of 10 and 85 is 850.
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