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Stack 9 Fact Fam +-

QuestionAnswer
9+10 9+10=19
10+9 10+9=19
19-9 19-9=10
19-10 19-10=9
9+9 9+9=18
18-9 18-9=9
9+11 9+11=20
11+9 11+9=20
20-9 20-9=11
20-11 20-11=9
9+12 9+12=21
12+9 12+9=21
21-9 21-9=12
21-12 21-12=9
Created by: dmahoney
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