Toyokan Publishing Co., Ltd. Lecture: New Developments in Arithmetic Instruction 4, Grade 4 Selling due to decluttering. There is damage that doesn't show up completely in the photos. I tried my best to capture it, as seen in the fourth photo. We, including my family, have a smoke-free and pet-free environment. Bulk purchases are also welcome. "Lecture: New Developments in Arithmetic Instruction 4" Shin Sansu Kyoiku Kenkyukai (New Arithmetic Education Research Group)