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| 420: | 2 | 2 | 3 | 5 | 7 | |
| 1540: | 2 | 2 | 5 | 7 | 11 | |
| GCF: | 2 | 2 | 5 | 7 |
The Greates Common Factor (GCF) is: 2 x 2 x 5 x 7 = 140
| Greatest Common Factor (GCF) of 1 and 529 | | Greatest Common Factor (GCF) of 198 and 380 | | Greatest Common Factor (GCF) of 63 and 380 | | Greatest Common Factor (GCF) of 60000 and 408 | | Greatest Common Factor (GCF) of 4200 and 64 | | Greatest Common Factor (GCF) of 40000 and 72000 | | Greatest Common Factor (GCF) of 404 and 364 | | Greatest Common Factor (GCF) of 1156 and 506 | | Greatest Common Factor (GCF) of 453 and 125 | | Greatest Common Factor (GCF) of 1152 and 968 | | Greatest Common Factor (GCF) of 468 and 793 | | Greatest Common Factor (GCF) of 720 and 1513 | | Greatest Common Factor (GCF) of 213 and 71 | | Greatest Common Factor (GCF) of 1175 and 1000 | | Greatest Common Factor (GCF) of 11750 and 100 | | Greatest Common Factor (GCF) of 20687 and 10001 | | Greatest Common Factor (GCF) of 1081 and 329 | | Greatest Common Factor (GCF) of 779 and 391 | | Greatest Common Factor (GCF) of 651 and 504 | | Greatest Common Factor (GCF) of 44 and 492 | | Greatest Common Factor (GCF) of 779851 and 1 | | Greatest Common Factor (GCF) of 394 and 16 | | Greatest Common Factor (GCF) of 180 and 973 | | Greatest Common Factor (GCF) of 0.048 and 0.048 | | Greatest Common Factor (GCF) of 112 and 910 | | Greatest Common Factor (GCF) of 31 and 131 | | Greatest Common Factor (GCF) of 100 and 1090 | | Greatest Common Factor (GCF) of 345 and 678 | | Greatest Common Factor (GCF) of 260 and 189 | | Greatest Common Factor (GCF) of 284 and 288 | | Greatest Common Factor (GCF) of 181 and 480 | | Greatest Common Factor (GCF) of 735 and 375 |