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Units of Time Measurement

Mathematics Grade 4 Difficulty 2/5

Beginning of the lesson

Understanding Time Measurement

What is Time?

Time is the continuous flow of moments from the past to the future. It measures when events happen and how long they last. Everyone experiences the same flow of time, and we use special units to measure it!

The Complete Time Unit System

Second1 secheartbeatMinute60 secshort taskHour60 minclass periodDay24 hourssunrise to sunriseWeek7 daysschool weekMonth28-31 dayscalendar monthYear12 months365 daysCentury100 yearshistorical periodTime Units: From Smallest to Largest

Complete Conversion Table

FromToMultiply/DivideExample
1 minuteseconds× 603 minutes = 3 × 60 = 180 seconds
1 hourminutes× 602 hours = 2 × 60 = 120 minutes
1 hourseconds× 3,6001 hour = 1 × 3,600 = 3,600 seconds
1 dayhours× 242 days = 2 × 24 = 48 hours
1 weekdays× 73 weeks = 3 × 7 = 21 days
1 yearmonths× 122 years = 2 × 12 = 24 months
1 yeardays× 365 (or 366)1 year = 365 days
1 centuryyears× 1002 centuries = 2 × 100 = 200 years

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In the full lesson

  • The complete explanation
  • Worked examples
  • Common mistakes and how to avoid them
  • Test questions: 46
  • AI tutor that answers questions about the topic
  • Progress tracking for students, parents and teachers