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The factors of 21 are 1, 3, 7, and 21. The factors of 49 are 1, 7, and 49.
7 (7 x 3= 21, 7 x 7=49)
21
The greatest common factor of 21 and 49 is 7.21 = 3 x 7, 49 = 7 x 7 so GCF = 7.
The GCF is 7.