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| 21000: | 2 | 2 | 2 | 3 | 5 | 5 | 5 | 7 | |
| 18375: | 3 | 5 | 5 | 5 | 7 | 7 | |||
| GCF: | 3 | 5 | 5 | 5 | 7 |
The Greates Common Factor (GCF) is: 3 x 5 x 5 x 5 x 7 = 2625
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