Main quantitative relationship formula:

1, number of copies x number of copies = total; Total number of copies/number of copies = number of copies; Total copies/number of copies = number of copies

2, 1 multiple× multiple = multiple; Several multiples ÷ 1 multiple = multiple; Multiply/Multiply = 1 Multiply

3. Speed × time = distance; Distance/speed = time; Distance/time = speed

4. Unit price × quantity = total price; Total price/unit price = quantity; Total price ÷ quantity = unit price