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Subtraction to 20
0
%
0
0
0
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Restart
12-4
8
Oops!
Okay!
12-2
10
Oops!
Okay!
17-7
10
Oops!
Okay!
11-10
1
Oops!
Okay!
11-2
9
Oops!
Okay!
12-3
9
Oops!
Okay!
6-4
2
Oops!
Okay!
16-8
8
Oops!
Okay!
13-4
9
Oops!
Okay!
3-1
2
Oops!
Okay!
14-5
9
Oops!
Okay!
20-2
18
Oops!
Okay!
15-3
12
Oops!
Okay!
14-5
9
Oops!
Okay!
18-2
16
Oops!
Okay!
13-4
9
Oops!
Okay!
15-3
12
Oops!
Okay!
20-6
14
Oops!
Okay!
11-2
9
Oops!
Okay!
15-5
10
Oops!
Okay!
20-4
16
Oops!
Okay!
6-3
3
Oops!
Okay!
4-1
3
Oops!
Okay!
9-3
6
Oops!
Okay!
14-4
10
Oops!
Okay!
4-2
2
Oops!
Okay!
10-6
4
Oops!
Okay!
12-3
9
Oops!
Okay!
19-1
18
Oops!
Okay!
13-3
10
Oops!
Okay!
14-3
11
Oops!
Okay!
18-4
14
Oops!
Okay!
18-3
15
Oops!
Okay!
16-10
6
Oops!
Okay!
12-6
6
Oops!
Okay!
10-4
6
Oops!
Okay!
14-2
12
Oops!
Okay!
8-3
5
Oops!
Okay!
14-3
11
Oops!
Okay!
14-2
12
Oops!
Okay!
13-10
3
Oops!
Okay!
18-1
17
Oops!
Okay!
15-2
13
Oops!
Okay!
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