Answer:
GCF: 4 LCM:60
Step-by-step explanation:
gcf-6, lcm-60
factors of 20: 1, 2, 4, 5, 10, 20
factors of 12: 1, 2, 3, 4, 6, 12
multiples of 20: 20, 40, 60, 80, 100
multiples of 12: 12, 24, 36, 48, 60, 72
