Fast calculation skills of calculation problems

Fast calculation skills of calculation problems

Using the ten-point method

If there are two numbers in the formula or several numbers can be added together to get ten, then you can calculate 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. Adopt integer method

Is to treat numbers close to 10, 100, 1000 as integers, and then add and subtract. 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.

Use shift method

Shift the number in the formula with the previous symbol, 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. In this regard, how do you educate your children to use fast algorithms? Please leave a message and say it!