What number is missing? 1, __, 3, 2, 5, 4, 1, What number is missing? 3, __, 5, 6, 3, 4, 2, What number is missing? __, 7, 5, 6, 8, 9, What number is missing? 7, __, 9, 10, 7, 6, 8, What number is missing? 9, __, 11, 8, 10, 9, What number is missing? 11, __, 13, 12, 11, 14, 10, What number is missing? 13, __, 15, 12, 14, 16, 13, What number is missing? __, 17, 15, 19, 18, 16, What number is missing? 17, __, 19, 16, 20, 18, 17, What number is missing? 19, __, 18, 21, 19, 20, What number is missing? 21, __, 23, 21, 22, 20, 24, What number is missing? 23, __, 25, 24, 23, 22, 26, What number is missing? __, 27, 29, 28, 25, 26, What number is missing? 27, __, 29, 27, 28, 26, 30, What number is missing? 29, __, 30, 28, 29, 31, 3 + 2 = ?, 4, 3, 5, 6, 5 + 1 = ?, 5, 7, 6, 4, 4 + 3 = ?, 5, 7, 6, 8, 6 + 2 = ?, 8, 7, 9, 6, Tom has 5 balloons. 2 balloons fly away. How many balloons are left?, 4, 3, 2, 5, Maria has 3 apples. She gets 2 more. How many apples does she have now?, 6, 5, 4, 3, 10 - 3 = ?, 7, 8, 6, 5, 10 - 6 = ?, 6, 5, 3, 4, 9 - 5 = ?, 4, 5, 6, 3, 8 - 4 = ?, 5, 6, 4, 3, 4 - 3 = ?, 1, 2, 3, 0, 6 - 2 = ?, 3, 4, 2, 5, 7 - 2 = ?, 5, 6, 4, 3, 5 - 1 = ?, 6, 5, 4, 3, 7 + 1 = ?, 9, 8, 7, 6, 2 + 5 = ?, 6, 7, 8, 5

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