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 Feb 16 awarded Famous Question Dec 5 awarded Notable Question Jul 19 awarded Popular Question Sep 26 awarded Supporter Sep 26 accepted Calculating the Modular Multiplicative Inverse without all those strange looking symbols Sep 24 comment Does $\gcd(40,80)$ = $40$ or $20$ This is a much longer answer than the one I intended to accept when I asked you to turn the comment into an answer, but I accept anyway. Sep 24 revised Calculating the Modular Multiplicative Inverse without all those strange looking symbols Programmer Code Layout Sep 24 suggested approved edit on Calculating the Modular Multiplicative Inverse without all those strange looking symbols Sep 24 comment Calculating the Modular Multiplicative Inverse without all those strange looking symbols That is good to know. I would still like to know how I could calculate this myself. Sep 24 awarded Scholar Sep 24 accepted Does $\gcd(40,80)$ = $40$ or $20$ Sep 24 comment Calculating the Modular Multiplicative Inverse without all those strange looking symbols I would like to keep it to the basic functions plus, minus, divide, remainder (modulus), power-of, and if I have to repeat a function many times to get to the final result, I can program that in no problem. If additional functions are necessary, that is fine. I am not sure what I need, but the Modular Multiplicative Inverse and Extended Euclidean are not something I understand. I am hoping that getting the mod_inverse can be broken down to a lower level. The calculator I am using is just a programming language that is capable of mod_inverse directly, but I would like to know what tha means. Sep 24 asked Calculating the Modular Multiplicative Inverse without all those strange looking symbols Sep 24 awarded Student Sep 24 comment Does $\gcd(40,80)$ = $40$ or $20$ @André, Please make that an answer so I can accept. Sep 24 revised Does $\gcd(40,80)$ = $40$ or $20$ edited title Sep 24 asked Does $\gcd(40,80)$ = $40$ or $20$ Feb 12 awarded Editor Feb 12 revised How can I systematically find a solution to this problem? Fix broken sentence in title Feb 12 suggested approved edit on How can I systematically find a solution to this problem?