Correct: 12+15=27, 15+15=30, 100+150=250, 17+9=26, 15-5=10, 12-8=4, 27-9= 18, 25-7=18, 13+13=26, 33+33=66, Incorrect: 12+15=26, 16--6=9, 35-5=28, 19+20=40, 50-20=20, 15+6=20, 19-1=17, 25-7=16, 43-13=21, 90-70=19,

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