Math workbook for 4th graders, develops basic skills in a workbook format. - Title: Basic Skills Training - Target Grade: 4th Grade - Publisher: SAPIX - Number of Pages: Problem set starting from 1 page - Contents: Math problem set - Format: Workbook format - Language: Japanese This covers 12 months, from February to January of the 4th grade. As shown in the second photo, there are light pencil markings in October. (The pressure is light, so it seems it can be cleaned up with an eraser.) For the other months, there are pen checks indicating correct or incorrect answers to some extent on the problem numbers and answer sections. Also, the answer key for November is missing, so I will share it with the buyer via images within Mercari. The answer keys for December and January are detached and included. Consistent daily practice can maintain good grades. My family used this every morning for 4th grade without going to a cram school. We didn't feel behind when we started attending cram school in 5th grade. I was surprised that they had developed their skills just from the basic training! We are looking forward to your purchase if you understand that this is a used item. The parts with names written on them have been cut out. Thank you for viewing.