Units of time

Lessons

In this lesson, we will learn:

• The different units of time: years, months, weeks, days, hours, minutes, and seconds
• The units of time for many years: decades, centuries, millennia
• How to convert between the different units of time

Notes:

• Units of time are intervals of time that measure duration
• The most common units of time that we see are: years, months, weeks, days, hours, minutes, and seconds

• Even longer intervals of time include: decades, centuries, and millennia

• When converting between different units of time:
• Multiply when changing from bigger to smaller time units
• Divide when changing from smaller to bigger time units
• Use the conversion list of equivalent times:

• Examples:

• Introduction
  Introduction to Units of Time:
  a)

  What are the different units of time?
  
  
  b)

  When to multiply or divide when converting units of time.
  
  
  c)

  How to convert between different units of time.
  
  

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• 1.
  Common Durations of Time
  Which unit of time should you use to describe the following?
  

  • Listening to a song?
  • Watching a movie?
  • Typing a question into a website browser?

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• 2.
  Converting Units of Time in a Table
  Fill in the table to convert between different units of time.
  a)

  Minutes and seconds
  
  
  
  b)

  Hours and minutes
  
  
  
  c)

  Days and hours
  
  
  
  d)

  Weeks and days
  
  
  

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• 3.
  Converting Between Different Units of Time
  Fill in the blanks by converting the times
  a)

  Between seconds, minutes and hours
  5 min = ____s $\qquad$ ____min = 2 h $\qquad$ 1 h = ____s $\qquad$ ____h = 240 min
  
  
  b)

  Between hours, days and weeks
  4 d = ____h $\qquad$ ____wk = 35 d $\qquad$ 1 wk = ____h $\qquad$ ____h = 3 d
  
  
  c)

  Between months, years, decades, centuries and millennia
  2 y = ____mo $\qquad$ __decades = 20 y $\qquad$ 5 centuries =__y $\qquad$ __millennia = 8000 y
  
  

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• 4.
  Comparing Different Units of Time
  Which amount of time is longer? Show your work; convert times into the same units to compare.
  a)

  90 min OR 1 h 40 min
  
  
  b)

  267 s OR 5 min 4
  
  
  c)

  126 h OR 4 d 21 h
  
  
  d)

  28 d OR 3 wk 5 d
  
  
  e)

  30 mo OR 2 y 5 mo
  
  

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