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Education Concept Tracker

A prerequisite knowledge graph of 1590 learning concepts across 8subjects. Track what you've mastered and see exactly what you're ready to learn next — the topics whose prerequisites you've already met. Built on the Marble Open Skill Taxonomy.

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Time Units and Calendar Facts

Mathematics · Measurement · conceptual

Know the number of seconds in a minute and the number of days in each month, year, and leap year

What mastery looks like

  • State that there are 60 seconds in a minute
  • Name the months and state the number of days in each
  • Explain that a leap year has 366 days and occurs every 4 years

Check your understanding

If you ask Time Units and Calendar Facts how many days are in September and whether this year is a leap year, can they answer both — and tell you how many seconds are in a minute?