GCSE Maths (Edexcel)

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Time Calculations

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Geometry and Measures Mensuration and Calculation

Time Calculations

7:55 Real-World Calculations
Spec N13 R1 G14
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  • Units of time such as seconds, minutes, and hours are used to measure the duration of events.
  • One hour is equal to 60 minutes and each minute contains 60 seconds, so one hour is equal to 3,600 seconds.
  • Digital clocks display the time with hours on the left and minutes on the right, separated by a colon.
  • When the minute number reaches the sixtieth minute of the hour, the hour number increases by one and the minute number resets to zero.
  • There are 24 hours in a day, so once the 24th hour is reached, the hour and minute numbers reset to zero.
  • Hours can be given in two sets of 12 hours, called a.m. and p.m.
  • A.m. stands for anti meridium (before midday) and p.m. stands for post meridium (after midday).
  • In the 24-hour clock, 2:37 a.m. is written as 02:37, while 2:37 p.m. is written as 14:37.
  • When converting from a.m. to the 24-hour clock, the hours are written as a two-digit number.
  • When converting from p.m. to the 24-hour clock, 12 is added to the number of hours.
  • The exceptions are 12 a.m., which becomes 00 in the 24-hour clock, and 12 p.m., which stays as 12.
  • A football match that starts at 9:45 and lasts for 105 minutes will end at 11:30.

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