【正文】 can be applied to calculation of, do know, and then carefully calculated, it is called “knife don39。做每一道計(jì)算題，千萬不要急于下手，首先要仔細(xì)觀察，明確應(yīng)該先計(jì)算哪一步，后計(jì)算哪一步，找一找哪些地方可以應(yīng)用巧算的方法，做到心里有數(shù)，然后再認(rèn)真計(jì)算，這就是所謂“磨刀不誤砍柴工”，我給學(xué)生改成了審題不誤計(jì)算功。Write a “7” scrawled “1”, and cause calculation is strict with students writing format, and lead by example, being a good role 、認(rèn)真審題。教師要嚴(yán)格要求學(xué)生的書寫格式，并以身作則，當(dāng)好榜樣。 math error reasons not to do, but not by heart, so I think to make students form good habits as 、規(guī)范書寫。在教學(xué)中，我發(fā)現(xiàn)學(xué)生計(jì)算題出錯(cuò)的原因并不是不會做，而是不用心，所以我認(rèn)為要讓學(xué)生養(yǎng)成如下良好習(xí)慣。2, daily life in the life mathematics, such as street to buy clothes, about how much money need to take, need to estimate。在隨家長買菜時(shí)，要特別留心售貨員是如何快速算出結(jié)果的。1, the present way of life.“New standard” pointed out: through to real life situations, make students experience, feel and understand the meaning of number and operations, to be presented to students a lot of realistic background, closely related to mathematics and the in teaching 36 x 4, I import in the following way: a top 36 yuan, how much do you need to buy 4 such blouse? This way of life for the calculation type questions, students are willing to 、日常生活數(shù)學(xué)化?！缎抡n標(biāo)》中指出：要通過現(xiàn)實(shí)生活的情境，使學(xué)生體驗(yàn)、感受和理解數(shù)與運(yùn)算的意義，要呈現(xiàn)給學(xué)生大量的現(xiàn)實(shí)背景，從中體會數(shù)學(xué)與生活的密切聯(lián)系。In addition to classroom teaching methods, the most effective way is to let students exercise in real life, in dealing with specific 、增強(qiáng)學(xué)生的實(shí)踐能力數(shù)學(xué)來源于生活，又服務(wù)于生活，而計(jì)算則是解決實(shí)際生活問題的重要手段。2, contact the actual as puting, rent a car number, floor number to buy brick, etc., must be an integer, and must adopt “into a”。40=10003927 present 35 material present 40 4000 = 1000聯(lián)系實(shí)際估算法。s life background, the different way of thinking, to estimate the results may not be the same, therefore, allow a certain range between estimation results with the accurate value of error of plus or minus as:783+945≈800+900=1700Material 800 783 + 945 + 900 = 17003927247。估算過程中，由于學(xué)生的生活背景、思維方式的不同，估算結(jié)果也不一定一樣，因此，允許估算結(jié)果與準(zhǔn)確值之間有一定范圍的誤差，正負(fù)誤差均可。 ability of intuition thinking has a lot of the same time, strengthen the estimation, can deepen students understanding of digital, promote the cultivation of number sense, enhance the consciousness of applied mathematics, improve the ability of solving practical the teaching, I regularly throughout some estimation techniques and methods:近似估算法。 ability to estimate, therefore, not only can make students39。在教學(xué)中，我經(jīng)常性地貫穿一些估算的技巧和方法：In our daily life and production practice, some calculation and the measurement result can39。因此，重視學(xué)生估算能力的培養(yǎng)，不僅可以使學(xué)生的思維更加靈活，而且對學(xué)生的直覺思維能力的培養(yǎng)有很大的幫助。 logical thinking and the role of oral expression 、重視估算，教給方法Third, the value estimate, teach method在日常生活和生產(chǎn)實(shí)際中，某些計(jì)算和測量的結(jié)果無法得到或沒有必要得到精確計(jì)算結(jié)果或判斷時(shí)，就要用到估算的方法。t required that every student(should)use a variety of methods to solve the same problem, but rather to encourage students to think independently and solve with suitable methods, ability can use a variety of methods, without the need of students in a algorithm diversity, also want to pay attention to the optimization method, for students to e up with every kind of right way to give affirmation, persuade students give up their backward trival, to follow the outstanding, simple method, so as to make their thinking ability constantly for middle and senior each kind of algorithm, can calculate, make its own instructions in order to prevent the “l(fā)earning, don39。特別要對中、高年級提出的每一種算法，可讓其自己說明算理，以防止其“知其然，不知其所以然”，同時(shí)起到培養(yǎng)學(xué)生邏輯思維和口頭表達(dá)能力的作用。算法多樣化不是要求每個(gè)學(xué)生都用多種方法解決同一問題，而是要鼓勵(lì)學(xué)生獨(dú)立思考，用適合自己的方法解決，有能力的可以運(yùn)用多種方法，沒有這種需求的學(xué)生只用一種即可。To make the student union, must make it clear to calculate, this requires teachers to the algorithm and the principle of teaching must be correct, because the first impression is very important, for the first time speak wrong, it is hard to remove it a psychologist said: first perception of new knowledge, proactive inhibition of information into the brain can be affected by the interference, can leave deep impression in students39。但如果首次感知不準(zhǔn)確，那么造成的不良后果在短期內(nèi)是難以清除的。Try some division mercial law: differential try to mercial law, with the head in addition to business method