This is a math textbook for sixth graders that covers combinations. - Title: The Fun of Learning! Pyramids - Grade Level: 6th Grade - Subject: Math - Content: Problems related to combinations - Cover Design: Colorful gradient design Thank you for looking. This was used by a child at a cram school. I have checked the contents and erased any writing. There are no problems for studying. Answers and explanations are also included. Thank you.