怎样使学生在考试或作业时能够及时发现和有效纠正错误,使解题准确、完整呢?我在教学中着重从以下三个方面指导学生。 (一)用“估算法”分析解出的答数是否在预料的取值范围内。对于一步计算的试题,如加减法中,和不小于任何一个加数,差不大于被减数。倘若不是,肯定错了。乘法中,乘数大(小)于1,积一定大(小)于被乘数;除法中,除数大(小)于1商一定小(大)于被除数,否则也错了。对于四 How to make the students in the examination or homework can be found in time and effectively correct mistakes, so that problem-solving is accurate and complete? In my teaching, I focus on guiding students from the following three aspects. (A) with “estimation method” analysis of the answer is within the expected range of values. For one-step calculation test questions, such as addition and subtraction, and not less than any one plus, less than less than Minus. If not, certainly wrong. Multiplication, the multiplier (small) in 1, product of a certain large (small) in the multiplicand; division, the divisor large (small) in a business must be small (large) in the dividend, otherwise it is wrong. For four