估算在社会生活中应用十分广泛,用步测丈量土地、用目测测量距离等都用到估算。因此,新教材从小学一年级到六年级都不同程度地增加了估算内容,以培养学生的估算意识和估算技巧,发展学生的估算能力。然而,教材中设计的一些题,教师们在教学过程中,往往无所适从。问题一:易口算,且 Estimation is widely used in social life, measuring land by step measurements, and measuring distances by visual inspection. Therefore, the new textbooks from the first grade to the sixth grade are increased to varying degrees, the contents of the estimate to develop students ’awareness and estimation techniques to develop students’ ability to estimate. However, some problems in the design of teaching materials, teachers in the teaching process, often confused. One problem: easy to count, and