2. 1 multiple × multiple = multiple1multiple = multiple/multiple = 1 multiple.
3. Speed× time = distance ÷ speed = time ÷ distance ÷ time = speed.
4. Unit price × quantity = total price/unit price = total quantity/quantity = unit price.
5. Work efficiency × working hours = total workload ÷ work efficiency = working hours ÷ total workload ÷ working hours = work efficiency.
6. Appendix+Appendix = and-one addend = another addend.
7. Minus-Minus = Minus-Minus = Minus+Minus = Minus.
Multiplication:
(1) How much is a few.
(2) How many times is a number?
③ Find the area and volume of the object.
(4) Find the fraction or percentage of a number.
Department:
① Divide a number into several parts on average and find out one of them.
② Find out how many other numbers are in a number.
(3) Given a fraction or percentage of a number, find this number.
(4) Find a number that is several times that of another number.