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

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