Factor them.
5 x 5 x 5 x 7 = 875
2 x 2 x 2 x 5 x 5 x 5 = 1000
Select the common factors.
5 x 5 x 5 = 125, the GCF
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875 = 53*7 1000 = 23*53
The GCF of 89 and 1000 is 1.
Since 25 is a factor of 1000, it is automatically the GCF.
The Greatest Common Factor (GCF) is: 5
The GCF is 1.