Oral arithmetic is a mathematical method that is often used in our life. For students, it is mainly used in primary school. Mastering certain verbal skills can make math learning get twice the result with half the effort and make children fall in love with learning math. There are many quick skills of oral calculation, which are suitable for different ages. In my opinion, mastering the following quick skills of oral calculation can basically meet the needs of daily study, life and work.

1. If there are two numbers or several numbers in the formula that can be added together to get ten, you can calculate ten by changing the order of the numbers. For example, 13+8+7, we can switch the positions of 8 and 7, first calculate 13+7, and then add 8 to get the final answer. Doing so can quickly get the answer and improve the efficiency and accuracy of the operation. The method of subtracting and adding ten is the same. First, add the subtractions that can be added to 10, and then subtract them from the minuend to get the answer.

2. Integer method is to treat numbers close to 10, 100 and 1000 as integers, and then add and subtract them. For example, for solving the problem 397+ 123, we can regard 397 as 400, then use 400+ 123 to get the answer 523, and finally subtract 3 to get the final answer 520. Can also be used in subtraction, the operation method is the same.

3. shift the numbers in the formula together with the previous symbols by shift method, and then calculate. This is a method that can often be used in primary school mathematics oral calculation. For example, 3-4+5, many children don't know how to answer. They don't think 3 can be subtracted from 4. In fact, we can get the answer quickly by moving 5 together with the preceding plus sign and converting it into 3+5-4.

In addition, there are specific skills such as complement grammar, split method and bracket method. For students of different levels, they only need to master certain skills.