"Yoku Wakaru Mathematics I Problem Collection" By Hajime Yamashita Price: ¥800 Gakken "Yoku Wakaru Mathematics A Problem Collection" By Hajime Yamashita Price: ¥800 Gakken This is a set of two books. There are no visible markings, and the condition is good, but there are minor scratches. *Please refrain from purchasing if you are concerned, as these are older problem collections. [Shipping Method] We plan to ship via Rakuraku Mercari Bin (anonymous shipping).