¡Kawashima Ryuta Kyoju No Mainichi Tanoshimu Otona No Drill No Wo Kitaeru "Keisan" 60 Nichi 2
¡Kawashima Ryuta / Cho
Description
[Machine Translation] Easy-to-read text and the ability to record your results on your smartphone encourage you to continue! The program is designed to activate your brain by solving simple math problems as fast as possible, solving 100 math problems a day, one on each side of the page.
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