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| 840: | 2 | 2 | 2 | 3 | 5 | 7 |
| 56: | 2 | 2 | 2 | 7 | ||
| GCF: | 2 | 2 | 2 | 7 |
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 7 = 56
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