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| 640: | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 5 | |
| 100: | 2 | 2 | 5 | 5 | |||||
| GCF: | 2 | 2 | 5 |
The Greates Common Factor (GCF) is: 2 x 2 x 5 = 20
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