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小学低段四则计算是100以内口算和笔算加、减法的综合练习,由于连加、连减、加减混合的情况较复杂,有时要进位、退位,有时又不进位、退位;有时完全用笔算,有时既要口算又要笔算。学生在计算时出现的错误较多,但一经提醒,能立即改正,却又不能自觉地检查出错误。这些被人们称为“粗心”的通病,不少教师感到棘手和困惑。
The calculation of the four low-section primary school is less than 100 within the mouth count and pen arithmetic addition and subtraction of the comprehensive exercise, due to even add, even minus, add and subtract mixed situation is more complicated, and sometimes to carry, abdicate, and sometimes do not carry, abdicate; , Sometimes it is necessary to have a calculation and calculation. Students in the calculation of the error occurred more, but upon alert, can be corrected immediately, but can not consciously check out the error. Many of these teachers are uncomfortable and confused by what they call “carelessness.”