Speed in Milli Seconds
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000
3500
4000
4500
5000
Count
2
3
5
8
10
15
20
25
30
Single / Double Digit
Single
Double
Complexity Level
Only Positive Numbers
Both Positive and Negative Numbers
Start
?
?
Show Answer