2. Multiplication and division: the basic concepts and operation rules of multiplication and division of numbers, such as multiplication and division, commutative law and associative law.
3. Comparison of numbers: master the comparison of numbers greater than, less than and equal to symbols.
4. Number sequence: master the number sequence, such as arranging a group of numbers from small to large or from large to small.
5. Equality and inequality of numbers: master the use of symbols of equality and inequality of numbers and compare them.
6. Carry and abdicate numbers: Understand the concept of decimals and be able to carry and abdicate decimals.
7. Decomposition of numbers: A number can be decomposed into the sum or product of several numbers, for example, 8 can be decomposed into 5+3 or 2×4.
8. Composition of numbers: Master the number of digits of a number and the meaning of each digit, such as ten digits and one digit.
9. Read and write numbers: be able to read and write a number correctly, including integers and decimals.