Science workbook for 3rd and 4th graders. - Title: Z-Kai Grade Up Workbook - Target Grade: 3rd-4th grade - Subject: Science - Publisher: Z-KAI Purchased several years ago and used a few times. Out of 97 pages (excluding answer key, etc.), there are writings on up to 27 pages. Also, there are signs of use on the cover in some places. Please purchase if you are okay with this. I have a cat. I remove hair and dust before shipping, but I apologize if any remain. Therefore, I recommend that those with severe cat allergies refrain from purchasing. Thank you for looking.