Educational materials to cultivate thinking skills through applied problems. - Title: Thinking Skills Training, 1st Grade - Publisher: KUMON A workbook for 1st graders to develop thinking skills through applied problems." #1stGrade #Workbook #KumonPublishing #Book #ReferenceBook #Work #Drill #Elementary1 Used, with some writing. I have erased the writing as much as possible, but there is a sense of use. Please consider this item with the understanding that it is a used product.