Mathematical judgment of the second volume of the first grade of primary school: 100, vertical calculation of carry addition, correct numbers but poor writing. Yes! Because about the calculation problem, the ultimate goal we want is the accuracy of the calculation results. Of course, "the number of digits adds up to ten, and input 1" is only one of the steps to learn the calculation problem, and it is not the standard to judge whether the calculation result of a calculation problem is correct or not.