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#fillintheblanks #reversecalculation This is the perfect problem to test your mental arithmetic skills. It's a so-called reverse calculation problem, but once you get the hang of it, you'll be able to solve it easily. The time limit is set slowly, so please check your calculations carefully. =============================== This channel introduces good and interesting arithmetic and mathematics questions with completely original, easy-to-understand explanations. We also publish a variety of fun quiz questions, such as puzzle solving, kanji quizzes, and trivia quizzes. [Subscribe to the channel here] / @world_fancy BGM material: YouTube Audio Library / audiolibrary Amacha's Music Studio https://amachamusic.chagasi.com/ Background video material: Original [WEB site] Netafact https://factdy.click/netafact/ [Twitter] World Fancy / world_fancy_