Understanding of 1 sum number. Understand numbers within 100 million, compare the sizes of multiple digits, and express large numbers, approximation numbers, positive numbers and negative numbers in units of 10,000 and 100 million.

2, the number of operations. (Two-digit multiplication, three-digit division, three-step mixed operation with brackets, counter)

3. explore the law. (Multiplicative commutative law, associative law, distributive law, additive commutative law, associative law, quotient invariant law)

4. Understanding of graphics. (Line segment, ray, parallel line, right angle, fillet)

Measure. (measurement unit, draw angle with protractor, measure angle)

5, graphics and location. (The position is represented by several pairs on the grid paper, and the position of the object is determined by the direction and distance.)

6, graphics and transformation. (Simple comprehensive transformation of simple figure rotation of 90 degrees and translation rotation)

7. Simple statistics. (1 grid represents bar chart, simple chart and line chart of multiple cells)