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Where did ten days go?

6th GradeDecimalsabout 2 minCCSS 6.NS.B.3CCSS 5.NBT.A.2

Where did ten days go? Guess, then run a calendar for a thousand years.

Lesson Plan

Practice multi-digit decimal operations by tracking a small yearly error as it builds over centuries.

  1. Question: Ask what students spot and what they are curious about. Read “In 100 years, how far off is spring?” aloud. Have each student guess and say why.

  2. Question: Read “A leap day every 4 years. Just right?” aloud. Have partners explain their guesses to each other.

  3. Big idea: Pause. Ask a student to say the idea in their own words.

  4. Real-world application: Ask: Where else have you seen this?

  5. Your turn: Have students try their own. Ask them to predict before they test.

How to run it

  1. Whole classPut the lesson on the board. At each choice the class votes, then you select the winner.
  2. SoloShare the link, QR code, or post to Google Classroom. Each student gets to take their own path.