Correct: 20 + 15 = 35, 33+33 = 66, 25 + 29 = 54, 22 + 11 = 33, 75 + 6 = 81, Incorrect: 20 + 15 = 34, 8+9 =16, 25 + 30 = 62, 30 + 15 = 50, 9 + 72 = 88,

Adding Two-Digit Numbers

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