The seven abilities of mathematics include: abstract generalization ability, spatial imagination ability, reasoning ability, operational solving ability, data processing ability, application consciousness and innovation consciousness. The composition of numbers means that a number (total) can be divided into several parts, and several parts can be combined into a number (total). All numbers consist of combination and decomposition. In early childhood, only one number was divided into two parts. Overview of digital composition

(A) the composition of the relationship between numbers

The essence of the composition of> numbers is that there is an equal, complementary and interchangeable relationship between number groups and subgroups. It is a numerical operation at the conceptual level.

The composition of (1) numbers involves the relationship between three groups of numbers.

> (2) There are three interrelated relationships among three arrays: equivalent complement and exchange.

(3) Digital synthesis is a conceptual digital operation.