Correct: 0+9=9, 1+9=10, 2+9=11, 3+9=12, 4+9=13, 5+9=14, 6+9=15, 7+9=16, 8+9=17, 9+9=18, 10+9=19, 11+9=20, 12+9=21, 9-9=0, 10-9=1, 11-9=2, 12-9=3, 13-9=4, 14-9=5, 15-9=6, 16-9=7, 17-9=8, 18-9=9, 19-9=10, 20-9=11, 21-9=12, Incorrect: 1+9=9, 1+9=11, 2+9=10, 3+9=13, 4+9=12, 5+9=13, 6+9=16, 7+9=15, 8+9=18, 9+9=17, 10+9=20, 11+9=19, 12+9=22, 9-9=1, 10-9=0, 11-9=3, 12-9=2, 13-9=5, 14-9=4, 15-9=7, 16-9=6, 17-9=9, 18-9=10, 19-9=9, 20-9=12, 21-9=11,

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