300 + 400 = ___, 500, 600, 800, 700, 900 − 500 = ___, 300, 600, 400, 500, 200 + 700 = ___, 900, 1000, 700, 800, 1000 − 300 = ___, 900, 700, 800, 600, 500 + 200 = ___, 900, 700, 800, 600, 800 − 600 = ___, 100, 400, 300, 200, 100 + 600 = ___, 700, 600, 500, 800, 700 − 100 = ___, 500, 700, 600, 800, 400 + 500 = ___, 1000, 700, 800, 900, 900 − 400 = ___, 400, 500, 600, 300

Basic Addition and Subtraction

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