1, rounding method: This method is the most basic and simple operation. By converting other numbers into addition or subtraction with a certain number, the purpose of fast calculation can be achieved.

2. Decomposition method: This method decomposes a number into several numbers for addition and subtraction, and then performs simple operations by combination method.

3. Combination method: This method is based on the decomposition of numbers, putting the numbers that can be rounded up together, and then adding or subtracting them to simplify the calculation.

4. Exchange method: This method is to exchange the positions of the numbers in the original formula before calculation.

5. Extracting common factor: This method is to extract the same number in the original formula and then calculate it.

6. Fractional method: This method converts the numbers in the original formula into the addition or subtraction of fractions, thus simplifying the calculation.

Matters needing attention in simple operation of primary school mathematics;

1. Mastering basic concepts and algorithms: Students need to master the basic concepts and algorithms of primary school mathematics, which is the basis of simple operations. Only by deeply understanding these concepts and rules can we judge when to use simple operations and how to do them.

2. Observe the characteristics of the formula: When performing simple operations, you need to carefully observe the characteristics of the formula. For example, sometimes some numbers in the formula can be combined together, or some numbers in the formula can be separated, which can simplify the calculation.

3. Choose an appropriate operation order: In general, the calculation order of the four operations is to calculate brackets first, then multiply and divide, and finally add and subtract. However, in some cases, a more suitable operation sequence can be selected, thus simplifying the calculation. For example, if there are multiple multiplication operations in the formula, they can be calculated together first to avoid repeated calculations in subsequent calculations.

4. Flexible use of simple operation methods: On the basis of mastering basic concepts and operation rules, we should use simple operation methods flexibly. For example, when you can add two numbers to get an integer ten, you can add the two numbers first and then multiply the sum by a number, which can simplify the calculation.