1. Arithmetic: We can express a three-digit number as a combination of three digits: one hundred digits, ten digits and one digit, for example, 123= 100+20+3. Similarly, two digits can be expressed as a combination of ten digits and two digits, for example, 23=20+3. When we multiply a three-digit number with a two-digit number, we actually divide the two numbers into two parts, then multiply them separately, and finally add the results.
2. Algorithm: For example, when calculating 123×23. We can calculate it like this:
(1), decompose 123 into 100+20+3, and decompose 23 into 20+3.
(2) 100 and 20 are multiplied to get 2000.
(3) 100 and 3 are multiplied to get 300.
(4) Multiply 20 and 3 to get 60.
(5) Add the above three results and get 2300+60=2360.
Multiplication value:
1, multiplication is one of the basic mathematical operations, which can be used for calculation and more complex mathematical problems. Multiplication is widely used in mathematics, such as solving equations, proving theorems and deriving formulas. Through multiplication, we can simplify some complicated problems and get solutions faster.
2. multiplication can be used to solve some practical problems. In daily life, multiplication can be used to calculate the total price of goods, calculate the time span, calculate the output and so on. In scientific calculation and engineering technology, multiplication can be used to calculate physical quantities, analyze data and so on. Through multiplication, practical problems can be turned into mathematical problems, thus solving practical problems better.
3. Multiplication can be used to calculate and compare some complex numerical values. In the fields of finance, statistics and data analysis, multiplication can be used to calculate and compare some complex numerical values, such as probability and variance. Through multiplication, we can better understand the distribution and characteristics of data, so as to make better decisions and analysis.