Teach BCE/CE timelines while building integer understanding with this comprehensive Measuring Time Using Integers mini-unit. Designed for Grades 6–9, this cross-curricular resource helps students understand BCE and CE dates, positive and negative integers, historical timelines, and the Gregorian calendar in a clear, meaningful way. By connecting math and social studies, students learn how timelines function as number lines, strengthening both integer reasoning and historical thinking. This resou