Quick and accurate mental arithmetic tips make you surprised
math is a logical and logical science subject, but even so there are many tips to simplify the problem as if it is super hard and troublesome. the logic of mathematics sometimes
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The way to teach children fast mental arithmetic of Japanese people
dare to say that you will never find such interesting mental math or math rules in textbooks!
Tips 'mental arithmetic' you can't find in textbooks
learn fast calculation methods, mathematical rules that you can't find in textbooks or in school chairs ...