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计算能力的高低,在一定程度上取决于熟练的口算技能技巧。培养和训练学生的口算能力是数学教学的重要任务之一。口算训练特别要注意激发儿童的兴趣,提高他们的参与意识。 一、变换形式,扩展思维,形成熟记 利用孩子们的好奇心采取变换形式的方法促使学生熟记。20以内的加减法是口算的重点,是基础。在10以内的数的组成与分解相当熟练后,开始学习得数是11的加法,同时学习相应的减法。如果我们一味地让学生算、背2+9=11、11-2=9、11-9=2、3+8=11、11-8=3、11-3=8……学生就会感到没意思。若给一个数字如“13”,让学生在规定的时间内,看谁想出的算题多。于是7+6=13、8+5=13、4+9=13、13-9=4、13-7=6……学生越练越熟,思维也就越来越敏捷。再如学生背乘法口诀,如果
The level of computing power, to a certain extent, depends on proficiency in oral arithmetic skills. Training and training of students' numeracy skills is one of the important tasks of mathematics teaching. Special attention should be paid to stimulate children's interest in training and increase their awareness of participation. First, the transformation of the form, expanding thinking, the formation of memorization Children's curiosity to take the form of change to encourage students to memorize. Addition and subtraction within 20 is the key point, is the basis. After the composition and decomposition of numbers within 10 are quite proficient, begin to learn the addition of 11, and learn the corresponding subtraction. If we blindly let the students count, back 2 + 9 = 11,11-2 = 9,11-9 = 2,3 + 8 = 11,11-8 = 3,11-3 = 8 ... Students will feel Boring If you give a number such as “13”, let the students see who has come up with more questions in a given amount of time. So 7 + 6 = 13,8 +5 = 13,4 +9 = 13,13-9 = 4,13-7 = 6 ...... The more students become more familiar, the mind will become more and more agile. Another example is the students back to take the formula, if