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Under what circumstances should we use 1 to add or 1 to subtract units for the sixth grade application questions?
1, the unit "1" is in front of the score of the six-level application problem, and the unit "1" is known by multiplication and unknown by division. Greater than 1+ and less than 1-.

2. For example, there are only 105 chickens on the farm, and chickens are the unit of 1. Since the number of chickens is known, multiplication is used instead of division. There are more chickens on the farm than pigs 1/5, and the unit of pigs is "1". If there are many chickens, use 1+.