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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/subtraction-within-100/v/introduction-to-regrouping-borrowing Learn how to subtract 23 from 65 by thinking about tens and ones. Practice this lesson yourself on KhanAcademy.org ...
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