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To find the GCF of two numbers, the first step is to break them into their prime factors. In this case:
132 = 2x2x3x11
210 = 2x3x5x7
The next step is to identify any common prime factors. In this case both numbers have a 2 and a 3 as a prime factor. To find the greatest common factor, we just take these terms and multiply them together:
2x3=6.
Thus the GCF of 132 and 210 is 6.
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Answer: 10
