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To find the greatest common factor of two numbers, you first need to break them into their prime factors:
15 = 3x5
40 = 2x2x2x5
The next step is to identify any common factors. In this case, the only common factor is 5. Thus, the greatest common divisor of the numbers 15 and 40 is 5.
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Earn +20 ptsQ: What is the greatest common divisor of the numbers 15 and 40?
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