military time/ time problems

• Elapsed time


  The actual time taken from the starting time up to the ending time
• Time


  • 9:35 - 9 represents the number of hours, 35 represents the number of minutes
  • AM (ante meridian) - from midnight until morning before noon
  • PM (post meridian) - afternoon until before midnight
  • 1 hour = 60 minutes, 1 minute = 60 seconds
• Finding elapsed time


  1. Using a number line

  2. Subtracting end time from start time
• Estimated elapsed time is found by rounding the start and end times to the nearest 5 or 10 minutes, then subtracting
• Elapsed time examples


  • Andy cleaning house: 7:32 AM to 8:25 AM = 53 minutes
  • Alison washing clothes: 4:28 PM to 5:09 PM = 41 minutes
  • Jeff studying: 9:17 AM to 10:35 AM = 1 hour 18 minutes
  • Chris tutoring: 10 AM to 1 PM = 3 hours
• military time

  0100 - 1 am midnight 0600 - 6 am

  0200 - 2 am 0700 - 7 am

  0400 - 4 am 0800 - 8 am

  0400 - 4 am 0900 - 9 am

  0500 - 5 am 1000 - 10 am

  1100- 11 am 1200 - 12 noon
• military time

  1300 - 1 pm 1900 - 7pm

  1400 - 2 pm 2000 - 8pm

  1500 - 3 pm 2100 - 9pm

  1600 - 4pm 2200 - 10pm

  1700 - 5pm 2300 - 11pm

  1800 - 6pm
• what time is

  8 pm in military time?

  2000
• what time is 0000 in normal time?

  12 midnight
• what time 4 pm in military?

  1600
• what time is 2200 is normal time?


  10:00 PM