1, reverse check: This method recalculates every number in the original formula to check whether the result is consistent with the original question. For example, in addition, you can add each number again to check; In subtraction, we can check by subtracting the minuend from the added answer; In multiplication, division can be used to check; In the division operation, you can check by multiplication operation.
2. Rearrange the graphics: This method is checked by rearranging the graphics. For example, in addition, you can check by exchanging the order of numbers; In multiplication, we can check by changing the order of numbers.
3. Using inverse operation: This method is to check by using the inverse operation of the original problem. For example, in addition, you can use subtraction to check; In multiplication, division can be used to check; In the division operation, you can check by multiplication operation.
Importance of checking calculation:
1. Improve the accuracy of calculation: In mathematical calculation, calculation errors are easy to occur due to carelessness, carelessness or improper calculation methods. Through checking calculation, the calculation error can be effectively avoided or reduced and the calculation accuracy can be improved. This is especially important for the third grade students in primary school, because their computing ability and experience are relatively weak, and it is more necessary to ensure the accuracy of calculation through checking calculation.
2. Cultivate a rigorous way of thinking: checking calculation is a rigorous way of thinking, and the correctness of the calculation results needs to be verified through careful review, checking and comparison. This way of thinking not only has important application value in mathematical calculation, but also can be extended to other disciplines and daily life. By cultivating the thinking mode of checking calculation, students can develop rigorous and meticulous study habits and scientific attitudes.
3. Strengthen problem-solving methods: Checking calculation is an effective method to solve problems. In mathematical calculation, it is often necessary to verify the correctness of the answer by checking calculation. At the same time, when solving other problems, we can also verify the correctness of the problem-solving ideas and answers through checking calculation. For example, when solving an application problem, we can verify whether the answer conforms to the meaning of the problem and the actual situation through checking calculation. By mastering the checking calculation method, students can improve their problem-solving methods and abilities.