I really felt proud and good watching my friend's daughter but inside I was humiliated and was questioning my mind math. My husband always makes fun of me saying , you are studying to become a CPA and you rely too much on calculator. I don't have mind math, all I do is pressing buttons and I am sure teenagers who send messages press buttons pretty faster than me.
So I decided to spend like at least two hours a week to learn abacus. A few minutes daily. Never feel too shy to learn.