Lesson 69: Dates & Longer Periods of Time
Lesson 69 Learning Objectives:
Write dates in a variety of formats
Convert between hours, days, weeks, months, years, decades, and centuries
Find elapsed times in hours, days, weeks, months, and years
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Reflect:
Reflect in your math journal. Draw, create or write to share your thinking. See Lesson guide 69 for more reflection questions, real life anchoring, playful explorations and creative invitations.
If something happened 10,000 days ago, would it be closer to a decade or a century?
Two people each say they spent 168 hours on a project. One says, ‘That’s one week!’ The other says, ‘No way—it took forever!’ Can they both be right?”
If your birthday is on April 10, how many months and days until your next birthday?
Which feels longer to you: one hour waiting for something exciting, or one week of ordinary days? How does your body “measure” time differently than a clock does?
If a year is like a story with chapters, what are the “chapters” you notice — seasons, birthdays, holidays, changes in nature? How does thinking in stories help you sense how much time has passed?
How do you like to write the date?
Math Talk:
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
Which one doesn't belong? What is the same? What is different?
How do you make sense of dates?
Images and design, LM
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