1, addition and subtraction: addition. Let the children solve this problem by adding one group of projects to another, or by counting. For example, let them count the total number of two groups of apples. Subtraction. Take a part from a group of items, or use counting. For example, let the children count how many apples have been taken away.

2. Number comparison: compare sizes. Use comparison symbols (greater than, less than, equal to) to help children judge the size relationship between two numbers. For example, let them choose which number is bigger or smaller than another number. Sort. Let the children arrange a set of numbers in a certain order. For example, let them arrange a set of numbers in order from small to large or from large to small.

3. Know the basic shapes and figures: Know the shapes. Let children identify basic shapes by observing the shapes of objects, such as circles, squares, triangles, etc. Combined graphics. Let children combine basic shapes and draw other shapes, such as making houses with circles and rectangles.

Skills of explaining mathematical problems

1. Use visual tools: In order to help children better understand math problems, visual tools can be used, such as counting sticks, digital cards and graphic cards. By observing specific objects or figures, children can understand the problem more intuitively and make corresponding calculations.

2. Use games and interactions: Games and interactions help children's interest and participation in mathematics. Some interesting math games can be designed, such as math puzzles and digital mazes, so that children can use math knowledge to solve problems through games.

3. Guide thinking and discussion: When solving math problems, you can guide your children to put forward their own problem-solving ideas and encourage them to discuss problems with you. By guiding children to think and discuss, they can be helped to cultivate their logical thinking and problem-solving ability.

4. Use story situations: Integrating math problems into situational stories in life can make it easier for children to understand and remember. By creating story situations with children, we can link math problems with real life and stimulate children's interest in learning.

5. Pay attention to practice and practice: Mathematics needs constant practice and practice to be truly mastered. Provide enough practical opportunities to help children consolidate their mathematics knowledge and constantly improve their ability in practice.