Correct: 6+ 5=11, 17+17=24, 25-5=20, 90-7= 83, 57+3=60, 39+40=79, 40-4= 36, 30-5= 25, 11+9=20, 99+1=100, Incorrect: 6+5= 12, 17+17= 27, 25-5= 22, 90-7= 97, 57+3= 59, 39+ 40=70, 40- 4= 42, 30- 5= 30, 11+ 9=10, 99+1 =99,

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