This slide show involves a speech by Martin Luther King, Jr. on August 28th of the Mystery Year. Connect math and Black history for 6th, 7th, or 8th grade math students.Why August 28th? It was the date of the "I Have a Dream" speech.Topics: Clues for finding the Mystery Year involve equilateral triangles, basic operations with whole numbers, and number sense. INCLUDES17 PowerPoint screens including four screens with clues plus answer screens, an Extension, Historical Notes, and Quotes. The GIF p