A Year of Mathematics 2015 Calendar 12 x 12 inch 28 page wall calendar Monthly essays on pure mathematics at the high school level Civic and religious holidays, mathematicians' birthdays and their achievements, and other days of note are highlighted and described Number facts from -3 to 365 highlighted, identifying prime numbers, factorials, triangular numbers, squares, cubes, etc. There is space in each day to write appointments and reminders in pen or pencil