Working with time

Working with time

Pencil and paper
Overview
Connecting to the Curriculum
Marking Student Responses
Working with Students
Further Resources
This task is about working out time.
 
 
a) Jane did her violin practice from 2:40 p.m. until 3:10 p.m.
 
  i) Show her start and finish times on the clocks below.
 
 
          
 
 
  ii) How long did Jane practice for? ____________________
 
b) The clocks below show when Katie started and finished her art class.
 
 
         

 
  i) Show her start and finish times on the digital clocks below.
 
   
 
Start
  
 
Finish

 
  ii) How long was Katie's art class for? ____________________
Level:
3
Curriculum info: 
Maths, Geometry and Measurement, Measurement
Keywords: 
analogue time, digital time
Description of task: 
Students show, interpret, and do calculations on times in both analogue and digital forms.
Curriculum Links: 
This resource can help to identify students' understanding of duration of of events and reading a scale for the Measurement objectives.
Answers/responses: 
 
a)

 
i) Start time
Clock face showing 2:40 - the minute hand pointing at the 8 and the hour hand pointing past the 2 but before the 3 - difficult
or

                          

Clock face showing 2:40 - the minute hand pointing to the 8 but the hour hand pointing at the 2 - very easy

                         

Finish time
Clock face showing 3:10 - the minute hand pointing at the 2 and the hour hand pointing at or just past the 3 - very easy

NOTE: for both clocks: accept if the minute and hour hands are of equal length, but no marks if the hour hand is longer than the minute hand.

ii) 30 minutes, half an hour - moderate
b) i)  Start time 9:15 [Accept 21:15]  - very easy
    Finish time 9:55 [Accept 21:55] - moderate
ii) 40 minutes [Accept if answer = start time - finish time in b)i]. - easy
Based on a Y7 sample in March 1999.
Diagnostic and formative information: 
  Common error Likely reason
a) i)

b) i)

 Start time        8:10
Finish time     2:15
Start time        2:45
Finish time     10:50		 Transposes hour and minute hands.
a) ii) 1:30 Does not rename hours in subtraction.
b) i) Finish time 10:55 Assumes hour is that which is most closely pointed to
(i.e., 10 rather than 9).
b) i) Start time 3:45 Transposes hands and assumes hour is that most closely
pointed to.