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To simplify a subtraction problem using a tape diagram, break the numbers into smaller, manageable parts. For example, in 65 - 38, draw a tape representing 65 and divide 38 into 30 and 8. Subtract 30 first, leaving 35. Then subtract 8, resulting in 27. New number sentence: 65 - 38 = (65 - 30) - 8 = 27.
