1. Numbers recognition and writing: Children may have difficulties in recognizing and writing numbers, such as confusing numbers with letters, writing wrong numbers or missing zeros.

2. Basic calculation: children may make mistakes in simple addition and subtraction operations, such as adding carry, borrowing subtraction, and being unskilled in multiplication formulas.

3. Comparison of numbers: Children may have problems when comparing the sizes of two numbers, such as mistaking negative numbers for positive numbers and using "greater than", "less than" and "equal to" incorrectly.

4. Logical reasoning: Children may encounter difficulties in simple logical reasoning, such as not understanding the conditions and requirements in the topic and not being able to correctly analyze and solve the problem.

5. The concept of space: children may have some shortcomings in understanding and applying the concept of space, such as not being able to correctly judge the shape of graphics and not understanding the concepts of area and volume.

6. Measurement and unit: Children may make mistakes in simple measurement and unit conversion, such as not using a ruler correctly and not understanding the conversion relationship between length units.

7. Time concept: Children may have difficulties in understanding and using time concept, such as not reading time correctly and not understanding the sequence of time.

8. Data processing: Children may make mistakes when dealing with simple data, such as not collecting, sorting and analyzing data correctly.

9. Problem solving: Children may lack ideas and methods when solving practical problems, and it is difficult to apply what they have learned to real life.

10. Learning interest and self-confidence: Children may be afraid of difficulties and lack learning interest and self-confidence due to difficulties and setbacks in mathematics learning.