1. Multiplication per share × number of shares = total number of shares ÷ = total number of shares ÷ = number of shares.

2. Multiplication calculation 1 multiply× multiply = multiply/multiply +0 multiply = multiply/multiply = 1 multiply.

3. Distance calculation speed × time = distance distance ÷ speed = time distance ÷ time = speed.

4. Price calculation unit price × quantity = total price ÷ unit price = total quantity ÷ quantity = unit price.

5. Efficiency calculation Work efficiency × working time = total workload ÷ work efficiency = total workload ÷ working time ÷ working time = work efficiency.

6. Add addend+addend = sum-one addend = another addend.

7. Subtraction calculation of the minuend-minuend = difference minuend-difference = minuend difference+minuend = minuend.

8. Multiplication problem factor × factor = product product ÷ one factor = another factor.

Powder companion

The most commonly used method in simple calculation is multiplication and distribution law. Multiplication and division means ax(b+c)=axb+axc, where A, B and C are arbitrary real numbers. On the contrary, axb+axc=ax(b+c) is called the inverse application of multiplication and division (also called finding common divisor), especially when A and B are complementary to each other, this method is more useful.

Sometimes the law of additive combination is used, for example, a+b+c, and B and C are complementary, so that B and C can be combined and multiplied by A. If+in the above formula is replaced by X, it can also be simply calculated by the multiplicative associative law.