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小学数学20以内的加减法的口诀,是整数四则计算的基础。在教学中,由于采取口算、珠算的有机结合,充分发挥珠算的直观形象作用,效果很好。过去学生学到一百,学生数小棒,桌上要放一大堆,数起来很麻烦,而在算盘上则可直接表示,简单明了。珠算还可促进口算,如数5+2=7时,初入学儿童一般计算规律是把5根小棒和2根小棒合在
The formulas for addition and subtraction within the elementary mathematics of 20 are the basis for the calculation of the integer four. In teaching, due to the adoption of oral calculation, abacus organic combination of giving full play to the intuitive image of abacus, the effect is very good. In the past, students learned a hundred, a small number of students, put a lot of tables, counting up a lot of trouble, but the abacus can be directly expressed, simple and clear. Abacus can also promote port arithmetic, such as the number of 5 +2 = 7, the general rules of early school children is to put five small sticks and two small stick together