Subtraction Facts
Loading Images
Approach:  Station  
Level: Year 4 and year 8
Focus: Subtraction facts  
Resources:
Computer program on laptop computer, answer booklet
115kb
Questions/instructions:  

This activity uses the computer.
[The problems were presented on the computer screen and soundtrack at eight-second intervals. The answer sheets did not show the problem again.]
If you cannot answer a question, put an “x” where you would write the answer.

% responses
2009 ('05)

   % responses
2009 ('05)
y4 y8
y4
y8
1. 9 – 2 = 
6
71 (70) 96 (88)      
2. 15 – 6 = 
9
61 (62) 94 (89)
3. 13 – 4 = 
1
67 (67) 96 (94)
4. 7 – 0 = 
4
84 (86) 97 (94)
5. 18 – 9 = 
4
68 (66) 98 (93)
6. 12 – 6 = 
9
74 (78) 97 (96)
7. 17 –  
6
 = 11
47 (47) 89 (86)
8. 8 –  
3
 = 5
72 (70) 97 (94)
9. 11 –  
5
 = 6
57 (58) 93 (91)
10. 9 –  
9
 = 0
66 (61) 90 (88)
11. 18 –  
8
 = 10
72 (71) 97 (95)
12. 
1
 - 0 = 1
72 (68) 95 (93)
Total score: 16
4 (5) 38 (35)
13. 
12
 - 5 = 7
13 (14) 61 (60) 14–15 8 (10) 30 (30)
14. 
14
 - 4 = 10
32 (33) 76 (76) 11–13 34 (27) 23 (25)
15. 
16
 - 8 = 8
16 (20) 63 (65) 8–10 19 (24) 7 (6)
16. 
10
 - 7 = 3
15 (20) 65 (67) 0–7 35 (34) 2 (4)
 
Subgroup Analysis [Click on charts to enlarge] :
Year 4
Year 8
Commentary:
This task focused on quick recall or derivation of basic subtraction facts. At both year levels, there was little change in performance between 2005 and 2009. Finding the first number in a subtraction, with the answer given, proved particularly difficult. Year 4 Mäori students and year 8 Pasifika students scored substantially lower than their Pakeha counterparts.