Activity 01
My Daily Routine Timeline
Students create a timeline of their previous day, from waking up to sleeping. They then calculate the duration of key activities like school, playtime, and study time.
Explain the steps to calculate the duration between two given times.
Facilitation TipProvide a template to help students structure their timeline and calculations.
What to look forGive students an 'Exit Slip' with one elapsed time problem, such as: 'Recess started at 10:30 a.m. and ended at 10:55 a.m. How long was the recess?' Collect their answers as they leave the classroom to check for understanding.
RememberUnderstandAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→· · ·
Activity 02
Train Timetable Challenge
Using a simplified, fictional Indian Railways timetable, pairs of students calculate the journey duration between different stations. This can include journeys that are short or last several hours.
Analyse a school timetable to find the length of a class period.
Facilitation TipStart with journeys that do not cross p.m. from a.m. before introducing more complex routes.
What to look forA worksheet containing a mix of problems: direct calculation of intervals, word problems based on daily routines, and questions based on a simple bus or school timetable.
RememberUnderstandAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→· · ·
Activity 03
The TV Guide Mystery
In small groups, students use a TV guide to find the length of different shows. They can then answer questions like, 'Which show is longer?' or 'How much time is there between Show A and Show B?'.
Compare the duration of two different activities, like a movie and a cricket match.
Facilitation TipEncourage groups to use a mini-whiteboard to show their calculation strategy to the class.
What to look forStudents use a simple traffic light system (red, yellow, green) to indicate their confidence level in solving different types of elapsed time problems presented by the teacher.
RememberUnderstandAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→A few notes on teaching this unit
Begin by using a large demonstration clock to physically move the hands and count the minutes aloud. Then, introduce a number line as a visual tool to help students 'jump' from the start time to the end time. This 'counting up' strategy is often more intuitive than formal subtraction, especially when crossing an hour.
By the end of this lesson, you will be able to calculate the duration of any activity, whether it's a short cartoon or a long train journey, using just a start and end time.
Watch Out for These Misconceptions
Students subtract time as if it were a decimal number. For example, to find the time between 3:10 and 2:50, they might incorrectly calculate 3.10 - 2.50 = 0.60, thinking it is 60 minutes.
Explain that time is based on a system of 60, not 100. Use a clock face to count forward: from 2:50, it is 10 minutes to 3:00, and then another 10 minutes to 3:10. The total duration is 10 + 10 = 20 minutes.
Difficulty in 'borrowing' or 'regrouping' when subtracting time. For example, when solving 4:15 – 0:45, they get stuck because 15 is smaller than 45.
Demonstrate how to borrow 1 hour and convert it into 60 minutes. So, 4 hours and 15 minutes becomes 3 hours and (60 + 15) = 75 minutes. Now they can easily subtract: 75 minutes – 45 minutes = 30 minutes.
Forgetting to account for the change from a.m. to p.m. when calculating duration across noon.
Use a number line or timeline that clearly marks 12 noon. Break the problem into two parts: calculate the time from the start to 12 noon, and then from 12 noon to the end time, and add the two durations.
Methods used in this brief