1, data acquisition.

2. Division within the table (1).

3, the movement of graphics (a).

4. Division within the table (2).

5. Mixed operation.

6. Division with remainder.

7. Understanding of numbers within 10,000.

8. grams and kilograms.

9. Mathematical wide angle-reasoning.

10, always review.

Matters needing attention in comprehensive calculation formula (four operations):

1. If there is only addition and subtraction or only multiplication and division, it is calculated from left to right. For example, 2+ 1- 1=2, first calculate the number of 2+ 1, and then subtract 1 from the number of 2+ 1.

2. If primary operation and secondary operation exist at the same time, the secondary operation is calculated first.

3. If there are primary, secondary and tertiary operations (i.e. power, root and logarithm operations) at the same time, first calculate the tertiary operation, and then calculate the other two levels.

4. If there are brackets, count the numbers in brackets first (no matter what level, count first).

5. The third level should be counted in brackets, and then the second and first levels should be counted.