計算が爆速に？インド式数学【アサデス。】

This time, we received the following submission: "A friend of mine who just returned from India is running an Indian-style math workshop in Yanagawa City with her Indian husband. It's said to make calculations much faster, and I'm curious to see if it will be effective for someone like me who isn't very good at math. But I can't find the time to do it, so I'd like you to experience it for me." Once you've mastered it, you'll apparently be able to do all kinds of calculations incredibly quickly. We've investigated whether it's possible to achieve such results so easily. (December 5, 2023)