It was not the training, but the age-growth that fixed the carel
No use. Carelessness has nothing to do with training, it totally depends on age and personality. I made a same tool, which I can adjust the difficult level. My oldest always make 100% but he is slow (in every aspect). He is not the smartest kid (that can be in a math competition), but he is a steady achiever. The second son always rashes through tests and makes around 80%, no matter how many training he already finished. The training only made him very frustrated about math that he knows he has a weakness but has no known effective way to fix it. So I stopped the training in math. let him spent all his time on reading fictions. After 1 year, I gave him other sheets (difficulty level adjust to his grade), he easily made above 95% every time. So, I did not train my third this way. Save him from this repeative and no effect task.
大多数在这里出生长大的中国小孩，聪明度不可置疑（除和犹太人比外），但孩子往往粗心出错。
我孩子小的时候，市上还没有太多智力开发软件。为了训练孩子养成细心的习惯，我就在DOS环境里编了一个两位数四则运算考试软件，难度系数可调。每天每个孩子得完成大约100道题的考试，错过5题以上重做，做完才可看电视或玩。
开始时两孩子因为常出错很不高兴我给他们带的麻烦，不久他们的耐心就练出来了。
另外一个系的教授朋友听说后，也问我要了着软件去收拾他的孩子。
孩子这样细心不犯错的动力是做完了看电视或者玩。
一旦失去看电视或者玩这个动力，这种人造的细心随之立马消失。
No use. Carelessness has nothing to do with training, it totally depends on age and personality.
I made a same tool, which I can adjust the difficult level.
My oldest always make 100% but he is slow (in every aspect). He is not the smartest kid (that can be in a math competition), but he is a steady achiever. The second son always rashes through tests and makes around 80%, no matter how many training he already finished. The training only made him very frustrated about math that he knows he has a weakness but has no known effective way to fix it. So I stopped the training in math. let him spent all his time on reading fictions.
After 1 year, I gave him other sheets (difficulty level adjust to his grade), he easily made above 95% every time.
So, I did not train my third this way. Save him from this repeative and no effect task.