How to calculate 2 digits of Japanese people: Just know how to count

This will be an "extremely standard mental math method" with big calculations!

Computers must be an effective tool when helping us to solve complicated multiplication, multiplication, and multiplication operations, saving time and saving time.

However, if you are unfortunate when taking the exam or when you need it, you neglect the computer, it is "catastrophic". Did you leave the problem or unconditional surrender?

With the following mental arithmetic method of Japanese people, you will no longer worry when doing 2-digit, 3-digit multiplication!

See if this clip is "miraculous"? Certainly you will wonder why there is this mental arithmetic mechanism?

1 'think .

In fact, this method of mental arithmetic is simply an illustration of ordinary multiplication .

Let's take a look!

This calculation is very simple.

First, we show the two-digit number by straight lines and give them intersection right?

Leaving 2 straight lines interspersed with 3 straight lines is a multiplication of 2 x 3 = 6, and it will correspond to 6 intersection points.

Similarly, the intersection between 2 straight lines with 2 straight lines and a straight line with 3 straight lines is actually the calculation: (2 x 2) + (1 x 3) = 7.

And the leading 2 is 1 x 2 = 2.

Let's compare when we set the normal multiplication calculation!

The result "y" is not right?

Although many people think that this method is somewhat confusing, when ordering vertical as usual faster, but it will be very effective in large calculations! Do not believe you try it!