During this middle school math warm-up activity, students solve clues to find the Mystery Year of Agatha Christie's birthday. The clues involve logical reasoning with a truth table, least common multiple, order of operations with fractions, and perimeter of a rectangle. Your PDF download includes:2-page digital version with horizontal layout, prepped for Easel 1-page printable version2 pages of Teacher Notes including step-by-step Solutions and more.1-page file, How to Use History-Mystery Puzzle