Computations with time

This lesson comprises one (1) master class focusing on:

• Units of time
• Working with time
• Using time zones

Content:

Solve problems involving duration, including using 12-hour and 24-hour time within a single time zone

• Add and subtract time mentally using bridging strategies, for example,  from 2:45 to 3:00 is 15 minutes and from 3:00 to 5:00 is 2 hours, so the time from 2:45 until 5:00 is 15 minutes + 2 hours = 2 hours 15 minutes
• Add and subtract time with a calculator, including by using the 'degrees, minutes, seconds' button
  round answers to time calculations to the nearest minute or hour
• Interpret calculator displays for time calculations, for example, 2.25 on a calculator display for a time calculation means 2:15 hours or 2 hours 15 minutes
• Solve a variety of problems involving duration, including where times are expressed in 12-hour and 24-hour notation, that require the use of mixed units (years, months, days, hours and/or minutes)

Solve problems involving international time zones

• Compare times in, and calculate time differences between, major cities of the world, for example, 'Given that London is 10 hours behind Sydney, what time is it in London when it is 6:00 pm in Sydney?'
• Interpret and use information related to international time zones from maps
• Solve problems involving international time as it relates to everyday life, for example, determine whether a particular soccer game can be watched live on television during normal waking hours