Quick subtraction with borrowing.
N-Back Level
Higher N = more positions to hold in mind
Speed
Faster = less time to encode each step
Score
0/10
Avg Time
--s
Targeted Drill Recommended
Slow or error-prone when subtracting:
0
Hits
0
Misses
0
False+
0
Done
5
Max Span
0
Failed
0
Correct
--
Conflict Acc
0
Errors
0
Correct
--
Interfere Acc
0
Errors
0
Correct
0
Streak
--
Avg
Tap MATCH if same as 1 step back
0
Hits
0
Streak
0
False+
Swipe the direction of the MIDDLE arrow
0
Correct
0
Streak
--
Conflict %
Tap the UNIQUE digit's value (ignore the position)
0
Correct
0
Streak
--
Interfere %
Watch the sequence
5
Length
0
Done
5
Max