The composition of a number refers to dividing a number by the sum of its components, such as dividing 10 by 2 and 8, or dividing 20 by 4 and 16. This concept can help children understand the relationship between the composition of numbers and numerical values, and then help children master basic operations such as addition and subtraction.
The decomposition of numbers is the inverse operation of the composition of numbers, that is, a number is expressed as the sum of several numbers, for example, 10 is decomposed into 2+8, or 20 is decomposed into 4+ 16 and so on. This concept can help children understand the relationship between the decomposition of numbers and numerical values, and then help children master basic operations such as subtraction and multiplication.
The concepts of composition and decomposition of numbers first appeared in human mathematical literature. In the mathematical documents of ancient civilizations such as China, ancient Greece and ancient India, there are records about the composition and decomposition of numbers. For example, China's Nine Chapters of Arithmetic discussed the synthesis and decomposition of numbers.
The main content of mathematics:
1. Basic operations: The basic operations of mathematics include addition, subtraction, multiplication and division. These basic operations form the basis of mathematics and are often used in our daily life. By learning basic operations, mastering the four operations of numbers and the calculation methods of fractions and decimals, simple practical problems can be solved.
2. Algebra: Algebra is an important branch of mathematics, which mainly studies the operation of letters, characters and formulas. By studying algebra, we can master mathematical concepts such as equations, inequalities and functions and solve corresponding practical problems. Algebra also involves advanced concepts such as vector, matrix and determinant, which provides important mathematical tools for physics, engineering and computer.
3. Geometry: Geometry is a branch of mathematics that studies concepts such as shape, size and position. By studying geometry, we can understand the properties of plane and three-dimensional figures and master the calculation methods of length, area and volume. Geometry also involves abstract concepts such as points, lines and surfaces, which provides important training opportunities for spatial imagination.