¡Kawashima Ryuta Kyoju No Mainichi Tanoshimu Otona No Drill No Wo Kitaeru "Keisan" 60 Nichi
¡Kawashima Ryuta / Cho
Description
[Machine Translation] Easy-to-read text and the added ability to record results on your phone. Activate the brain by solving simple math problems as fast as possible; solve 100 math problems a day, one on the front and one on the back.
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