2. Explore the resources of teachin

2. Explore the resources of teaching materials and experience the important position of estimation. Looking at the new textbooks, it is not difficult for us to find that estimation has left a deep footprint in many areas of mathematics textbooks. As long as we handle the textbooks creatively, estimation is everywhere. In the field of number and algebra: the calculation teaching combined with addition, subtraction, multiplication and division can cultivate the awareness and ability of estimation in each class. For example, 4812 + 12, students are likely to miss the 0 in the quotient when calculating. If you estimate first, 4800 + 12 = 400, so the quotient of 4812 divided by 12 must be more than 400, which not only avoids calculation errors, but also cultivates The students' consciousness of making estimates consciously before calculation. In the field of space and graphics, "Mathematics Curriculum Standards" clearly pointed out: can estimate the length of some objects, estimate the area of ​​a given rectangle and square, estimate the surface area and volume of a given three-dimensional figure, and so on. In the field of statistics and probability, combining data collection and sorting, understanding statistical charts, estimating the size of possibilities, and so on.3. Cultivate mathematical thinking and experience the mathematical value of estimation. Estimation teaching can also train students' flexibility in thinking, make students' thinking more flexible, draw inferences about problems, learn by analogy, and transfer their thinking to a more hidden direction that is not easy for others to think of. For example, when comparing the sizes of 12/25 and 19/35 in teaching, some students think of passing points when they see that the larger and smaller ones are different denominators. In fact, this question does not need to pass points, as long as you estimate: 12/251/2, you can judge 12/25