Correct: 15 + 21 = 36, 42 - 35 = 7, 18 + 18 = 36, 23 + 17 = 40, 15 + 18 = 33, 75 - 56 = 19, 234 + 63 = 297, 754 - 264 = 490, 32 + 497 = 529, 41 + 71 = 112, 9 + 9 = 18, 200 + 350 = 550, 320 + 140 = 460, 45 - 40 = 5, 239 - 98 = 141, 652 + 217 = 869, 7 + 7 = 14, 8 + 29 = 27, 41 = 20 + 21, 17 = 109 - 92, Incorrect: 4 + 9 = 14, 32 + 32 = 74, 265 + 365 =750, 90 = 50 + 30, 42 = 40 + 3, 16 + 14 = 40, 13 + 25 = 38, 410 + 510 = 910, 825 = 225 = 620, 63 + 31 = 95, 19 + 7 = 27, 400 - 250 = 250, 150 - 78 = 62, 653 - 247 = 306, 87 + 96 = 173, 9 + 9 = 17, 3 + 16 = 20, 19 - 5 = 12, 7 + 7 = 15, 63 = 30 + 29,

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