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To find the GCF of two numbers you first need to work out the prime factors of those numbers. In this case:
30 = 2x3x5
40 = 2x2x2x5
The next step is to identify any common factors. In this case, both numbers have a 2 and a 5 as prime factors. To find the GCF, we simply multiply these numbers together:
2x5 = 10
Thus the GCF of 30 and 40 is 10.
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