This funny notebook features a pi symbol and says "Keep Calm and Calculate On." This is a great gift for teachers, professors, students, artists, mathematicians, mathletes, engineers, physicists, scientists, or anyone who loves math. Graph paper is excellent for writing, taking notes, sketching, drawing, mapping, designing, charting, work, school, and hobbies. Click "Math Books by Witty Logic" for more. Product details: 7.44 x 9.69 in Paperback 50 Sheets/100 Pages Quad Ruled Graph Paper 5x5 Black and White Glossy Cover