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CK-12 Foundation
Ck 12: Elementary Math: Difference Between Two Time Intervals
[Free Registration/Login may be required to access all resource tools.] Students compare the times on two clocks and calculate what time it will be before or after a given time interval, which clock shows an earlier or later time, etc....
Better Lesson
Better Lesson: Clock Facts
Students calculate elapsed time using analog clocks. Included in this lesson are a detailed plan, clock template, and video of students making their clocks.