Why Is Our Calendar So Weird!?

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Related

Algebraic Thinking →February →January →Math Puzzles and Challenges →
PD Lesson

Summary

Why are there 12 months? Why don’t weeks fit into months evenly? Why don’t weeks fit into the year evenly? What’s going on with the calendar!

  1. Students are asked (by the Supreme Council for Calendars) to clear up the confusing mess of 28, 30, and 31-day months by factoring 365.
  2. Students will discover that 365 has very few factors: 1, 5, 73, and 365 -- not so great for even months. We introduce intercalary days: days outside of any month. Students reserve a few days for a special holiday, then create nice, even months.
  3. Now students will divide those months into even weeks so that the year and each month have nice, whole numbers of weeks.
  4. Finally, we do some naming: what will we call our months? What about our days of the week?

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