Time Zones integers on a Number Line
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Time Zones integers on a Number Line
Year 7 Mathematics Using integers to understand global time differences 60-minute lesson
WALT - We Are Learning To
Identify UTC (Coordinated Universal Time) as zero on a global number line
Success Criteria
Position yourself correctly on a human number line using city time zones Use positive integers for cities ahead of UTC (like Tokyo +9) Use negative integers for cities behind UTC (like New York -5) Calculate time differences accurately using addition and subtraction Explain your methods using terms like 'positive', 'negative', 'distance between integers'
What do you know about time zones?
Think about when you call family overseas Why is it daytime here but nighttime somewhere else? What happens when you travel to different countries?
Understanding UTC as Zero
UTC = Coordinated Universal Time Located at Greenwich, London (0 degrees longitude) This is our 'zero point' on the number line All other time zones are measured from UTC East of UTC = positive integers (ahead in time) West of UTC = negative integers (behind in time)
Human Number Line Activity
Students will receive city cards with UTC offsets Stand on the correct integer position on the floor number line Remaining students act as questioners and helpers Calculate time differences between cities using your positions Practice with scenarios: London (0) to Tokyo (+9), Auckland (+12) to New York (-5)
Calculating Time Differences
14 students receive city cards with UTC offsets Stand on the correct integer position on the floor number line Remaining students act as questioners and helpers Calculate time differences between cities using your positions Practice with scenarios: London (0) to Tokyo (+9), Auckland (+12) to New York (-5)
Reflection and Next Steps
UTC is our zero point on the global time zone number line Positive integers represent time zones east of UTC (ahead) Negative integers represent time zones west of UTC (behind) Calculate differences by adding or subtracting based on position Extension: Explore fractional time zones like India (+5.5) Practice with worksheet problems using number line strategies