The GCD of given numbers is 140.
factors of 9800 are : | 1 , 2 , 4 , 5 , 7 , 8 , 10 , 14 , 20 , 25 , 28 , 35 , 40 , 49 , 50 , 56 , 70 , 98 , 100 , 140 , 175 , 196 , 200 , 245 , 280 , 350 , 392 , 490 , 700 , 980 , 1225 , 1400 , 1960 , 2450 , 4900 , 9800 |
factors of 420 are : | 1 , 2 , 3 , 4 , 5 , 6 , 7 , 10 , 12 , 14 , 15 , 20 , 21 , 28 , 30 , 35 , 42 , 60 , 70 , 84 , 105 , 140 , 210 , 420 |
factors of 2520 are : | 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 12 , 14 , 15 , 18 , 20 , 21 , 24 , 28 , 30 , 35 , 36 , 40 , 42 , 45 , 56 , 60 , 63 , 70 , 72 , 84 , 90 , 105 , 120 , 126 , 140 , 168 , 180 , 210 , 252 , 280 , 315 , 360 , 420 , 504 , 630 , 840 , 1260 , 2520 |
We see that the Greatest Common Factor = 140.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.