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Subtract 9's
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9 - 9
0
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Okay!
11 - 9
2
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17 - 9
8
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Okay!
16 - 9
7
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Okay!
13 - 9
4
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Okay!
10 - 9
1
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Okay!
18 - 9
9
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Okay!
12 - 9
3
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19 - 9
10
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Okay!
20 - 9
11
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Okay!
14 - 9
5
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Okay!
15 - 9
6
Oops!
Okay!
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