Share 9.) Subtraction to 20
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17 - 6
11
20 - 3
17
14 - 4
10
19 - 7
12
12 - 2
10
18 - 5
13
16 - 1
15
15 - 3
12
13 - 0
13
20 - 9
11
11 - 1
10
19 - 2
17
18 - 8
10
17 - 4
13
14 - 1
13
16 - 6
10
