International time difference

International time difference

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Working with Students
Further Resources
This task is about working with negative numbers and international time zones.
 
 
This table shows how many hours difference there is between New Zealand local time and the following countries and cities.
 
Cairns (C) ⁻2 Norfolk Island (NI) ⁻0.5
Athens (A) ⁻10 Tonga (T) +1
Paris (P) ⁻11 London (L) ⁻12
Osaka (O) ⁻3 Los Angeles (LA) ⁻20
Malaysia (M) ⁻4 Western Samoa (WS) ⁻23
 
 
a)
 
 
 
 
On the line above, show the differences in time between New Zealand and these places. Number the time line.
 
b) What is the time difference between Tonga and Osaka? __________
 
c)
If Jason left New Zealand at 11:00 a.m. on a 3-hour flight to Tonga,
 
what would be his arrival time in Tongan time? __________
 
d) If Mrs Hawera, who lives in New Zealand, wanted to speak to a person in Los Angeles at 9:00 a.m. on Thursday (their time), on what day and at which time should she telephone?
 
Day: __________          Time: __________
Task administration: 
This task can be completed with pen and paper or online (with auto-marking).
Level:
4
Description of task: 
Students answer questions about international time differences.
Curriculum Links: 
This resource can help to identify students' understanding of the measurement units of time for Measurement, and additive strategies (including negative numbers) for the Number and Algebra strand.
Learning Progression Frameworks
This resource can provide evidence of learning associated with within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
 

Y8 (10/1997)

a) Timetable completed.
NOTE: numbers under the time line may differ.
10 correct –  difficult
6-9 correct – moderate
b) 4 hours easy
c) 3:00 p.m. moderate
d) Friday 5:00 a.m. difficult


Diagnostic and formative information: 
  Common error Likely calculation Likely reason
c) 1 p.m.
2 p.m.
11 a.m. + 3 - 1
11 a.m. + 3
Assumes Tongan time is behind NZ time.
Ignores difference in time between Tonga and NZ.
d) Wed 1 p.m.
Fri 1 p.m.
Thur 9 a.m. - 20
9 a.m. + 4
Assumes U.S. time is ahead of NZ time.
Adds time (4 hrs) instead of subtracting it, (i.e., 9 a.m. + 4 instead of 9 a.m. - 4).