1, recalculation: The simplest method is to recalculate the original addition operation. Although this method is troublesome, it can ensure the accuracy of calculation. When recalculating, use the same numbers and operation symbols, and check each step carefully to avoid mistakes.
2. Checking calculation of exchange law: exchange law is a basic principle in mathematics, which shows that the order of addition operation does not affect the result. Therefore, the correctness of addition operation can be checked by exchanging the positions of addends. For example, for the addition of 10+20=30, we can use the exchange law to check: 20+ 10=30, which shows that the original calculation is correct.
3. Inverse operation: The inverse operation of addition is subtraction. Therefore, the correctness of the addition result can be verified by subtraction. For example, for the addition of 10+20=30, it can be checked by inverse operation: 30- 10=20, 30-20= 10, which shows that the original calculation is correct.
4. Checking by changing the order of numbers: Changing the order of numbers is also an effective checking method. For example, for the addition of 123+456=579, the order of numbers can be reversed: 456+ 123=579, which shows that the original calculation is correct.
Mathematical addition related information
1, mathematical addition is one of the most basic concepts in mathematics, which represents the process of synthesizing two or more arrays into a sum. The essence of addition is to add two numbers and get their sum. This process can be represented by the mathematical symbol "+". Addition is not only a basic mathematical operation, but also a common operation in people's daily life.
2. Addition has many important properties and applications. Addition is interchangeable and combinable, which means that no matter which number is added first, the result is the same. This property is very useful in calculating the sum of multiple numbers, which can simplify the calculation process. Addition satisfies reversibility, that is, the result obtained by adding one number and another number is the same as that obtained by subtracting these two numbers.
3. Addition also satisfies unitary, that is, any number plus 0 equals itself. This property is also very useful in solving some mathematical problems. Addition also has some special properties, such as the associative law and commutative law of addition. These properties are also very useful in solving some mathematical problems, for example, the exchange law can be used to simplify the calculation when calculating the combination number.