Name: 多位數乘法的標準方法介紹 (Introduction to standard way of multiplying multidigit numbers)
Uploaded: 2021-01-14T10:14:21.000Z
Duration: 4 min 25 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

to 不定詞

how we would approach multiplying something

And the way we're going to do it is the way

you would write the larger multi digit number on top

and then you would write the smaller single digit number

below that, and since it's in the ones place,

the seven, you would put it in the ones place column.

So you'd put it right below the ones place

in the larger number, so right below that two.

And then you'd write the multiplication symbol.

all right, I'm just gonna take each of these places

So, for example, if I'm taking those two ones

I can only put four of those ones over here.

But then you move over to the tens place.

You say, hey, what's nine tens times seven?

You can only put four of those tens over here.

So the other 60 tens you can express as six hundreds,

Now a lot of people would explain that as saying,

hey, nine times seven is 63, plus one is 64.

But hopefully you understand what we mean by carrying.

Only four of those tens can be expressed over here.

Or that's maybe the cleanest way to do it.

And then the other 60 tens you can express as six hundreds.

five hundreds times seven is going to be 35 hundreds,

and then you add six hundreds, you get 41 hundreds.

Now I wanna reconcile this, or connect it,

to with other ways that you might have seen this.

So one way that we've approached it in the past is

we say, all right, what's two times seven?

We're just representing it a little bit differently.

Then we might say, well what is nine times seven?

That's 63 tens, so you might write it right over there,

Well that's 35 hundreds, so you could write it like that.

Same thing as 3500, and then you would add everything up.

we were essentially regrouping things from here

and you could think about it where we're condensing

Here we just very systematically said two times seven,

but we made sure to keep track of the places

you could think of it as partial products, would be,

essentially regrouping the values when we said,

So I encourage you, one, it's good to learn this method.

It's the most common way that folks multiply.

Once again, your parents probably learned it this way,

字幕列表影片播放

多位數乘法的標準方法介紹 (Introduction to standard way of multiplying multidigit numbers)

stick

essentially

approach

figure