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

addition and subtracction group sort

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