Here are two mental arithmetic methods, which are suitable for addition and subtraction, and you can get the answer directly through mental arithmetic without column vertical! Even primary school students with poor math scores can get the happiness of successful calculation and increase their interest in learning math through this mental arithmetic method!

1 mental arithmetic method:

Let's take a math problem as an example: 645+468, this math problem, if you calculate it with your heart, how can you get the answer quickly without column?

645=600+40+5; 468=400+60+8; When adding, you can add 600 to 400, 40 to 60, 5 to 8. Finally, it is 1000 to 100 and 13. The mental result is 1 1 13. The correct calculation results are obtained without vertical columns.

Of course, this mental arithmetic addition needs constant intensive practice to improve the speed.

The second mental arithmetic method:

397+98+ 196=?

How to do it by calculation? Let's observe first, like these addends, it has a feature that it is close to the whole hundred. For example, 397 is close to 400, 98 is close to 100 and 196 is close to 200. Then we add 400 to 100, add 200 to get 700, and then subtract the result.