Starting and finishing

Starting and finishing

Pencil and paper
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Marking Student Responses
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This task is about time.
 
 
a) Maia does her keyboard practice from 7:35 a.m. to 8:10 a.m., and from 7:20 p.m. to 8:05 p.m., each day.
 
  i) Show her start and finish time for her evening practice on the digital clock faces below using 24-hour time.
 
    a) starting time   b) finishing time  
   
ii)		  
How long does she practise each day (morning and evening)? _______________
 
b) Mrs Somi started making panipopo at 1425 hours. As soon as she had made them she put them in the oven. They cooked for 45 minutes. The panipopo were taken out of the oven at 1605 hours.
 
  i) On the clocks below fill in the times when Mrs Somi:
 
    a) started making the panipopo
 

 		 b) finished cooking the panipopo
 
  ii)
How long did it take Mrs Somi to get the panipopo ready before putting them in the oven?
 
_______________
Level:
4
Curriculum info: 
Maths, Geometry and Measurement, Measurement
Keywords: 
analogue time, digital time, 24-hour time
Description of task: 
Students work out starting and finishing times, and how long events take.
Curriculum Links: 
This resource can help to identify students' understanding of working with 24-hour time for the Measurement objectives, and additive strategies for the Number and Algebra objectives.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Additive thinking, sets 7-8
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
 

Y8 (10/1997)
a) i)

ii)

 a)
b)		 19:20
20:05
80 minutes (1 hour 20 minutes)		 difficult
moderate
moderate
b) i)

ii)

 a)
b)		 clock hands showing 2:25
clock hands showing 4:05
55 minutes		 moderate
easy
very difficult
Diagnostic and formative information: 
  Common error Likely reason
a) ii) 160 Calculations based on 100 minutes in 1 hour.
b) ii) 135 or 1 hr 35 min Calculations based on 100 minutes in 1 hour.