Correct: 5+5, 2+8, 1+9, 10+0, 3+7, 8+2, 7+3, 9+1 , 4+6, 6+4, 11-1, 12-2, 15-5, 20-10, 100-90, Incorrect: 2+7, 1+8, 3+3, 4+4, 9+2, 8+8, 25-5, 100-5, 3+4, 3+3+1, 10+5, 11+1, 3+2, 2+3, 8+3,

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