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What mathematical thought is embodied in borrowing one and returning ten?
Analogy. Ten to one is the abdication calculation rule in mathematics teaching. The so-called abdication subtraction means that in subtraction, the unit of 1 of the adjacent high position is borrowed to the low position because of insufficient reduction of the low position, so the high position of 1 is 10, which breaks through the characteristic of one out of ten in vertical calculation and fully embodies the mathematical thought of analogy.