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| 63: | 3 | 3 | 7 | |
| 42: | 2 | 3 | 7 | |
| GCF: | 3 | 7 |
The Greates Common Factor (GCF) is: 3 x 7 = 21
| Greatest Common Factor (GCF) of 80 and 100 | | Greatest Common Factor (GCF) of 96 and 36 | | Greatest Common Factor (GCF) of 38 and 19 | | Greatest Common Factor (GCF) of 19 and 38 | | Greatest Common Factor (GCF) of 84 and 60 | | Greatest Common Factor (GCF) of 76 and 49 | | Greatest Common Factor (GCF) of 69 and 90 | | Greatest Common Factor (GCF) of 36 and 108 | | Greatest Common Factor (GCF) of 330 and 198 | | Greatest Common Factor (GCF) of 90 and 99 | | Greatest Common Factor (GCF) of 32 and 72 | | Greatest Common Factor (GCF) of 63 and 189 | | Greatest Common Factor (GCF) of 189 and 441 | | Greatest Common Factor (GCF) of 5767 and 4453 | | Greatest Common Factor (GCF) of 108 and 306 | | Greatest Common Factor (GCF) of 27 and 65 | | Greatest Common Factor (GCF) of 72 and 240 | | Greatest Common Factor (GCF) of 63 and 35 | | Greatest Common Factor (GCF) of 104 and 78 | | Greatest Common Factor (GCF) of 45678 and 87865 | | Greatest Common Factor (GCF) of 220 and 2408 | | Greatest Common Factor (GCF) of 5 and 125 | | Greatest Common Factor (GCF) of 90 and 210 | | Greatest Common Factor (GCF) of 27 and 343 | | Greatest Common Factor (GCF) of 200 and 165 | | Greatest Common Factor (GCF) of 135 and 42 | | Greatest Common Factor (GCF) of 183 and 100 | | Greatest Common Factor (GCF) of 14 and 12 | | Greatest Common Factor (GCF) of 8 and 98 | | Greatest Common Factor (GCF) of 18 and 70 | | Greatest Common Factor (GCF) of 15 and 90 | | Greatest Common Factor (GCF) of 14 and 84 |