Time Machine
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Approach:  Independent  
Level: Year 4 and year 8
Focus: Addition and subtraction; place value  
Resources:
Answer booklet
131kb
Questions/instructions:  

Imagine you have a time machine. You can travel in it from this year (2005) back to the past and forward to the future. The trip meter can be set to show you what year you will travel to.

 
% responses
2009 ('05)
y4
y8
1. Write what the trip meter will show if the time machine travels two years into the future from:
77 (76)
98 (95)
2. Write what the trip meter will show if the time machine travels twenty years into the future from:
57 (51)
94 (89)
3. Write what the trip meter will show if the time machine travels two hundred years into the future from:
32 (29)
85 (82)
YEAR 8 ONLY:
4. Write what the trip meter will show if the time machine travels two thousand years into the future from:
88 (81)
5. Write what the trip meter will show if the time machine travels two years back to the past from:
96 (92)
6. Write what the trip meter will show if the time machine travels twenty years back to the past from:
74 (69)
7. Write what the trip meter will show if the time machine travels two hundred years back to the past from:
64 (63)
8. Write what the trip meter will show if the time machine travels two thousand years back to the past from:
(zeros were left out)
72 (66)

Total score:
Y4 total score: 3
31 (27)
  
2
26 (24)
  
1
21 (27)
  
0
22 (22)
  
Y8 total score: 8
47 (37)
7
 
20 (25)
5–6
 
22 (23)
3–4
 
7 (8)
0–2
  
4 (7)
Subgroup Analysis [Click on charts to enlarge] :
Year 4
Year 8
Commentary:
Between 2005 and 2009 there was a small improvement for year 8 students. Year 4 students were much less successful in changing the hundreds digit than the tens or ones digit.