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What is a one-step method? What's the difference with rounding? (6) Mathematics
One-in-one method: that is, the missing position is greater than zero, and one should be entered;

Rounding method: that is, if the number of omitted digits is less than four, but the number of omitted digits is more than five, one digit must be entered;

There is also a kind of

Truncation method: that is, the omitted position should be discarded whether it is full or not;

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