In primary school mathematics teaching, it is necessary to enhance students' estimation consciousness and let primary school students master some simple estimation methods.

It is of positive significance to help students learn to observe and analyze the real society by using mathematical thinking mode and solve problems in daily life, so as to cultivate their sense of number and mathematical application.

Estimation method:

1, rounded: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, carry.

2. Prefetch method: Prefetch method is to add 1 to the last number after removing the redundant part of the reserved part. The obtained approximation is the residual approximation (that is, greater than the exact value).

For example, a sack can hold 200 Jin of wheat and 880 Jin of wheat. How much can a sack hold? When 880 is divided by 200, the quotient is 4 and the remainder is 80, which means it is impossible to fill 4 bags, so 5 bags must be filled.

3. Stereotyping: Stereotyping is a common mathematical evaluation method, which removes the decimal part, takes the integer part and takes its approximate value (that is, less than the exact value). This method is often used in life.

4. Quantity unit estimation method: use real-life objects to perceive the size of quantity units and actual empirical data.