Check by multiplication. According to the law of multiplication and exchange, multiply the multiplier and the multiplicand again. If the calculation is correct, the result of the two multiplications should be the same.
Check by department. Divide the multiplied product by one of the factors, and if the calculation is correct, the result should be equal to the other factor. The method of checking whether the result of multiplication is correct is called multiplication check.
For example:1/kloc-0 /×12 =132. Checking calculation:12×11=132,132 ÷1=12,/kloc-0 Checking the calculation can effectively find the mistakes in the calculation process, but it is of little use to solve the mistakes in thinking. By comparing the data obtained by checking calculation (deriving conditions with results) with the original data, it is suggested whether the operation is correct.
The importance of learn mathematics:
1. Mathematics is closely related to our life. To say that the real effect of learning mathematics is not reflected in exam-oriented education, but in my own thinking about the future.
2. The importance of mathematics is self-evident. Mathematics is the foundation of all sciences and an important channel to cultivate logical thinking. It can be said that every major progress of our mankind is strongly supported by mathematics.
3. The application of mathematical knowledge in life is everywhere. From the calculation of daily living costs, to astronomy, geography, quality control, agricultural economy, aerospace, there are shadows of using mathematics.