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在进行加减运算时，为了又快又好，除了要熟练地掌握计算法则外，还需要掌握一些巧算方法。加减法的巧算主要是运用“凑整”的方法，把接近整十、整百、整千……的数看作所接近的数进行简算。进行加减巧算时，凑整之后，对于原数与整十、整百、整千……相差的数，要根据“多加
In addition and subtraction operations, in order to fast and good, in addition to proficiency in the rules of calculation, but also need to know some trick calculation method. Addition and subtraction of the trick is mainly the use of “rounding” approach, the number close to the whole ten, a hundred, a thousand ... ... as the number of close to the number of simple calculations. Addition and subtraction when count, after the rounding, the original number and the whole ten, the whole hundred, the whole thousand ... a difference between the number, according to "more