While the task is focusing on basic facts, students may use strategies to work out their answer. This can then help to identify students' ability to use strategies for addition or subtraction tasks.
Diagnostic and formative information:
Student response
Likely misconception
a)
b)
iii)
ii)
iii)
v)
6
5 or 7
11 or 13
5 or 7
Miscalculation by 1 - Either Way
Addition out by 1
Subtraction out by 1.
NOTE: When the answer is out by 1 it may imply unsuccessful "counting on" or "counting back".