一、熟练口算,奠定基础据观察与统计,学生计算错误的主要原因是口算不熟练,尤其以加法与乘法计算最为突出。扎扎实实练好口算,对防止计算错误有奠基作用。1.20以内的进位加法口诀和乘法口诀要求学生达到脱口而出的程度。对20以内的进位加法口诀,可利用数的组成,凑十法或相同两数相加等方法来理解记忆。比如,8+7=15,可通过 First, proficient mouth count, lay the foundation According to observation and statistics, the main reason for students to calculate errors is unskilled mouth, in particular, the addition and multiplication is the most prominent. To do a good job in a down-to-earth manner has a cornerstone role in preventing miscalculation. Within 1.20 carry addition formulas and multiplication formulas require students to reach the level of blurted out. Addition of formulas within 20 sums, the number can be used to make up the number of ten or the same method of adding two numbers to understand the memory. For example, 8 + 7 = 15, can be passed