Show:
Addition
Subtraction
2 digit addition
2 digit subtraction
surprise
100
0+5
5
100
9-2
7
100
10+12
22
100
21-20
1
100
17-5
12
200
2+6
8
200
8-3
5
200
11+10
21
200
30-5
25
200
17+12
29
300
4+5
9
300
8-5
3
300
13+15
28
300
18-5
13
300
6+6
12
400
6+3
9
400
5-3
2
400
15+9
24
400
30-6
24
400
14+6
20
500
5+1
6
500
8-2
6
500
10+20
30
500
50-25
25
500

15+15

30