1, know the counting units "hundred" and "thousand", and know and believe the decimal relationship between the two counting units; Master the number sequence within 10 thousand, and can read and write numbers within 10 thousand; Knowing the composition of the number within 10,000 will compare the size of the number within 10,000, and can describe the size of the number within 10,000 with symbols and words; Understand and identify approximate numbers within 10,000.

2. Two digits within100 can be added or subtracted, integer hundreds and thousands can be added or subtracted, and hundreds and dozens can be added or subtracted, which can be estimated according to the actual situation.

3. Know the meaning of division, the names of each part in the division formula, and the relationship between multiplication and division; Can skillfully use multiplication formula to find quotient.

4. Understand the significance of mathematical problems, and realize the close relationship between discovering and asking questions from life and mathematics and daily life. Knowing the function of brackets, I will use brackets in solving problems.

5, can distinguish acute angle and obtuse angle; Initially perceive the phenomenon of translation and rotation, a simple figure will translate horizontally or vertically on the grid paper.