所谓估算,实质上是一种快速的近似计算,它的基本特点是对数值作适当扩大或缩小,从而对运算结果确定一个范围,或做出一个估计·本质地看估算,它应该是一种数学意识,是理性思维能力的具体表现·一般地,运算能力的指标可归纳为:准确、熟练、合理、简捷·而运算的合理性是运算能力 The so-called estimation is essentially a fast approximate calculation. Its basic feature is to appropriately expand or reduce the numerical value, so as to determine a range of the calculation result, or to make an estimate. In essence, it should be a kind of estimation. It should be a kind of Mathematical awareness is a concrete expression of rational thinking ability. In general, the indicators of computational ability can be summarized as: accurate, proficient, reasonable, and simple. The rationality of computation is computational ability.