1, it is known that the number of A is more than the number of B, that is, A is more and B is less; Know less and get more, and use the method of "decimal+difference = large number" to calculate; If you know more and ask for less, use the method of "large number-difference = decimal" to calculate. (Note: more increases, less decreases)

2. It is known that the number of A is less than the number of B, that is, the number of A is less, the number of B is more, and much less is known. Calculate by the method of "decimal+difference = large number"; If you know more and ask for less, use the method of "large number-difference = decimal" to calculate. (Note: more increases, less decreases)