Question: how to find hcf of two large numbers?
Answer: Step III: Divide the first divisor by the first remainder. Step IV: ... 
Step II: The first divisor is 18 and the remainder is 12, so we need to divide 18 by 12. [Divide the first divisor by the first remainder]. ... 
Step I: Here we need to divide 180 by 75. [Divide the larger number by the smaller one].