Answer :
Factors of 24: 1; 2; 3; 4; 6; 8; 12; 24
Factors of 40: 1; 2; 4; 5; 8; 10; 20; 40
Factors of 56: 1; 2; 4; 7; 8; 14; 28; 56
GCF(24; 40; 56) = 8
Factors of 40: 1; 2; 4; 5; 8; 10; 20; 40
Factors of 56: 1; 2; 4; 7; 8; 14; 28; 56
GCF(24; 40; 56) = 8