Understanding and operation of numbers, basic knowledge of space geometry, understanding and conversion of measurement units such as time, length, weight and capacity.

1. Recognition and operation of numbers: such as comparison of natural numbers, addition and subtraction, carry and borrow, etc.

2. Basic knowledge of space geometry: such as the understanding of plane figures, the basic concepts of edges, angles and planes, and the understanding of straight lines, line segments and rays.

3. Understanding and conversion of time, length, weight, capacity and other units of measurement: such as shopping and riding applications.