Share Addition/Subtraction to 20
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8 + 7
15
17
16
14
15 - 9
8
6
4
5
6 + 9
14
17
16
15
14 - 6
1
7
8
6
10 + 5
13
15
16
12
18 - 7
11
8
9
6
9 + 4
9
12
13
10
13 - 8
6
2
5
4
7 + 6
11
13
14
12
16 - 9
7
5
2
6
5 + 8
16
14
12
13
12 - 7
5
3
4
2
4 + 9
13
14
12
15
17 - 8
4
9
6
5
3 + 7
12
9
11
10
11 - 5
6
4
5
2
