LCM and HCF Practice Test 2

33 – 3 = 30, 64 – 4 = 60 and 80 – 5 = 75
Now, HCF of 30, 60 and 75:
30 = 2 × 3 × 5
60 = 2 × 2 × 3 × 5
75 = 3 × 5 × 5
∴ Common factor = 3 × 5 = 15
∴ Required largest number = 15.