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精确计算本质上是对数的运算,有利于培养学生的抽象能力估算本质上是对数量的运算,有利于培养学生的直观能力。根据现在的数学知识划分,类似于“21×59≈”属于精确计算中的粗略计算,不作为估算教学的内容。只有在解决具体的实际问题中的近似计算才叫做估算,所以课程标准更加强调在现实的情境中培养学生的估算意识和估算方法。在小学阶段,估算问题要有合适的实际背景,否则就失去了估算的教育意义。第一学段估算:根据情境选单位。估算往往涉及在哪个单位上
Accurate calculation is essentially a logarithmic operation, is conducive to the cultivation of students ’abilities to calculate abstraction is essentially the number of operations, is conducive to developing students’ intuitive ability. According to the current division of mathematical knowledge, similar to “21 × 59 ≈ ” is a rough calculation of accurate calculation, not as an evaluation of teaching content. Only approximate calculation in solving concrete practical problems is called estimation. Therefore, the standard of curriculum emphasizes more on cultivating students’ estimation consciousness and estimation method in realistic situations. In the elementary school stage, there should be a suitable practical background for estimating the problem or else the estimated educational value will be lost. The first semester estimates: According to the situation selected units. Which unit is often involved in the estimation?