Answer:
Problem #1) GCF = 5
Problem #2) LCM = 72
Problem #3) GCF = 8
Problem #4) LCM = 45
Problem #5) 12 and 18
Problem #6) 20 and 40
Explanation:
Let me know if you want me to explain these by commenting, and i can write an explanation for each problem! Hope this helped!