The GCF is 1.
21 and 42 have a GCF of 21. 40 and 80 have a GCF of 40. The GCF of 21 and 40 is 1.
The GCF is 1.
The GCF of these numbers is 40.
The least common multiple of 21 , 43 = 903
50
21 and 42 have a GCF of 21. 40 and 80 have a GCF of 40. The GCF of 21 and 40 is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
40 + 44 = (4 x 10) + (4 x 11) = 4 x 21 = 84
The GCF is 1.