Class 5 Notes - Time

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Introduction

Time is a crucial aspect of our daily lives. The measurement of time has been essential in human history, from ancient sundials to modern atomic clocks.

Units of Time

  • 1 minute = 60 seconds
  • 1 hour = 60 minutes
  • 1 day = 24 hours
  • 1 week = 7 days
  • 1 month = 30 or 31 days (28 or 29 for February)
  • 1 year = 12 months = 365 days (366 days in a leap year)
  • 1 century = 100 years
  • 1 millennium = 1000 years

Measuring Instruments

  • Clock
  • Watch
  • Sundial
  • Hourglass
  • Stopwatch
  • Atomic Clock

Reading the Clock

A clock can be analog or digital. The hour, minute, and second hands help determine time accurately.

Time Conversion

  • Minutes to Seconds: Multiply by 60
  • Hours to Minutes: Multiply by 60
  • Days to Hours: Multiply by 24
  • Weeks to Days: Multiply by 7
  • Years to Days: Multiply by 365 or 366

Word Problems

Problem: A train journey starts at 9:30 AM and ends at 3:15 PM. Find the duration.

Solution: 5 hours 45 minutes.

Importance of Time

Time management is essential for daily routines, sports, transportation, and scientific research.