The greatest common factor of 2940 and 3150 is 210. Source: http://www.mathwarehouse.com/arithmetic/numbers/GCF/greatest-common-factor-calculator.php
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As a product of its prime factors: 2*3*3*5*5*7 = 3150 or as 2*32*52*7 = 3150
(30, 3150), (90,1050), (150, 630) and (210, 450).
It is: 3150/3600 = 7/8 in its lowest terms
It is already expressed as a whole number in the form of 3150
882/2 = 441/3 = 147/3 = 49/7 = 7/7 = 13150/2 = 1575/3 = 525/3 = 175/5 = 35/5 = 7/7 = 12 x 3 x 3 x 7 x 7 = 8822 x 3 x 3 x 5 x 5 x 7 = 31502 x 3 x 3 x 7 = 126, the GCF