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Stack 9 Fact Fam +-
Question | Answer |
---|---|
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 |