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
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