一、在明确算理的基础上进行口算练习口算正确且达到脱口而出的程度,关键是引导学生在理解算理掌握正确计算方法的基础上进行练习。在教学10以内加减法时,采用直观教具、学具操作相结合,引导学生眼看、耳听、动口、动手、动脑,使之牢固掌握数的分解与组成,为口算正确迅速奠定基础。学生理解了算理、掌握了算法,就能如鱼得水、运用自如,因此在学习20以内加减法时学生均能运用算理、算法正确迅速地进行口算。如口算“9+ First, on the basis of a clear calculation of the Mouth arithmetic exercise Mouth count correctly and reach the level of blurted out, the key is to guide students to understand the arithmetic to master the correct calculation method based on the practice. When teaching additions and subtractions within 10, a combination of visual aids and learning tools should be used to guide students to see and hear, move their mouths, start their hands and move their minds to make them firmly grasp the decomposition and composition of numbers so as to lay a solid foundation for the correct calculation. Students understand the arithmetic, mastered the algorithm, can be like a duck, easy to use, so when learning addition and subtraction within 20 students can use arithmetic, the algorithm quickly and correctly port count. Such as mouth count ”9 +