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任何复杂的问题都是由一个个简单的问题组合而成的,无论是两位数乘除两位数,还是两位数乘除三位数,或者其他更复杂的计算题,它们的基础都是“20以内的加减法”。教学实践表明,“笔算的错误”大部分是由于学生“20以内加减法”不过关,达不到不假思索、脱口而出的程度造成的。对于小学一年级的学生来说,他们天真烂漫,对于所学习的科目既陌生又有强烈的兴趣。要想
Any complicated problem is a combination of simple questions, whether it is a double-digit multiplication or division of two digits, a double-digit multiplication or division of three digits, or other more complex calculation questions, all based on “Addition and subtraction within 20”. Teaching practice shows that “pen calculation error ” is mostly due to students “20 addition and subtraction ” But the pass, reach without thinking without thinking, blurted out to the extent caused. For first-year primary students, they are innocent and are both strange and intensely interested in the subjects they learn. Want to