Common factors of 420, 735, and 945 are: 1, 3, 5, 7, 15, 21, 35, and 105.
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Since 84 is a factor of 420, it is automatically the GCF.
The GCF is 105.
105, 210, 315, 420, 525, 630, 735, 840, 945 +105 . . .
Here are some multiples of both 15 and 7: 105, 210, 315, 420, 525, 630, 735, 840, 945.
Obtain the prime factors of both numbers. 450 = 2 x 3 x 3 x 5 x 5 735 = 3 x 5 x 7 x 7 The factors common to both numbers are 3 and 5. The GCF is 3 x 5 = 15