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不少家长让幼儿三四岁起,就进行大量的加减计算,为上小学打基础。我有个学生,入小学前他爸爸手把手地教1+1=2,2+2=4,5-1=4……甚至将四位数的不进位加法,不退位减法的竖式都教过了。到底这个孩子掌握了多少数学知识呢?入小学摸底测试中,发现该生10以内的加减计算还可以,但是当问到,“10是由几和几合成的”时,他只能答出“5和5”、“1和9”两组答案。叫他从51倒数到1时,他困难地数着,通过老师的启发才算完成了倒数。当问到:“小华站在一行队伍中,从前往后数是第四个,从后往前数是第二个,问这一行人有多少个?”时,他哑口无言。证明这个孩子
Many parents let their children start their studies at the age of three or four and carry out a large number of addition and subtraction calculations to lay the foundations for primary school. I have a student, his father before elementary school hands to teach 1 + 1 = 2,2 +2 = 4,5-1 = 4 ...... Even the four-digit non-carry addition, does not abort subtraction vertical taught pass. In the end the child mastered the number of mathematical knowledge? Into the elementary test, found that the students within 10 addition and subtraction can be calculated, but when asked, “10 is composed of a few and several”, he can only Answer two sets of answers, “5 and 5”, “1 and 9”. When he was asked to count down from 51 to 1, he counted with difficulty. The countdown was completed by the teacher’s inspiration. When asked: “Xiaohua stood in his party, the number from the back is the fourth, from the back number is the second, ask the number of pedestrians?”, He dumbfounded . Prove this child