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| 840: | 2 | 2 | 2 | 3 | 5 | 7 | |||
| 800: | 2 | 2 | 2 | 2 | 2 | 5 | 5 | ||
| GCF: | 2 | 2 | 2 | 5 |
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 5 = 40
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