:Algorithms (Subtraction)
Trend Task
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Approach: Independent  Level: Year 4 and year 8
Focus:   Subtraction calculation
Resources: Answer booklet
148KB
Questions / instructions:

Write your answers in the white boxes.You can use the shaded area to do your working.
   
% responses
2005 ('01)
Y4
Y8
1.
2 7
– 5
2 2
78 (71)
93 (91)
2.
6 7
– 4 3
2 4
65 (73)
95 (93)
3.

6 8 4
– 3 2
6 5 2
56 (64)
91 (90)
4.

8 7
– 7 9
8
24 (33)
75 (77)
5.

5 4
– 2 6
2 8
27 (35)
76 (77)
YEAR 8 ONLY:
6.
4 7 2
– 2 3 4
2 3 8
•
72 (74)
7.
7 1 5
– 4 1 7
2 9 8
•
63 (67)
8.
5 0 0
– 2 1 5
2 8 5
•
57 (63)
9.
8 2 3 8
– 3 5 2 9
4 7 0 9
•
66 (69)
Total score:
9
•
36 (33)
  7–8
•
35 (40)
5–6
15 (22)
10 (10)
3–4
39 (38)
14 (10)
1–2
34 (26)
5 (6)
[Note: Maximum score of 5 for year 4] 0
12 (15)
1 (1)

Commentary:
Year 4 students showed difficulty when subtraction required regrouping. Year 8 students were much stronger at the basics but had some difficulty with more complex problems. There was a slight decline at year 8 level from 2001 to 2005, and a more substantial decline at year 4 level.
 
Chapter Graphic
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