One is the child's ability to judge problems, and the other is the child's problem-solving thinking. If the solution is correct and there is no problem, it may be a sloppy problem. It is necessary to cultivate the child's ability to be serious and careful, let him learn calligraphy and the like, calm down, do more exercises, do the wrong questions again, or change the numbers and calculate them again, and exercise his ability to draw inferences from one another. practice makes perfect