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The first step to working out the greatest common factor of 4,000 and 1,800 is to break these numbers down into their prime factors:

4000 = 2x2x2x2x2x5x5x5

1800 = 2x2x2x3x3x5x5

The next step is to identify any common factors. In this case, there are common prime factors of three 2s and two 5s. Multiply these together and you get 2x2x2x5x5 = 200

Thus the greatest common factor of 4,000 and 1,800 is 200.

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Q: What is the greatest common factor of 4000 and 1800?
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