1
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Now, let's do the exact
same addition problem

2
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that we did in the last video.

3
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But I'm going to expand out
these numbers so that we really

4
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understand what's
going on when we're

5
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doing all of this carrying.

6
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So this 5 is in
the hundreds place.

7
00:00:11,490 --> 00:00:14,730
So it really represents
5 hundreds or 500.

8
00:00:14,730 --> 00:00:17,670
3 represents 3 tens because
it is in the tens place.

9
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So it represents 30.

10
00:00:19,150 --> 00:00:23,000
And the 6, well, it just
represents 6 ones or 6.

11
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Likewise, this 3 represents 300.

12
00:00:26,940 --> 00:00:31,180
This 9 is 9 tens or 90.

13
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And this 8 just
represents 8 ones or 8.

14
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And now we can add these two up.

15
00:00:37,590 --> 00:00:42,140
Now let's start in the
right-most column-- this ones

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column.

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6 plus 8, we've
already figured out,

18
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is equal to 14, which is
the same thing as 10 plus 4.

19
00:00:54,064 --> 00:00:55,480
So let's write the
part that's not

20
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a multiple of 10 in
this ones column.

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So let's put that 4 there.

22
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And the part that
is a multiple of 10,

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we can now carry into
this tens column.

24
00:01:02,708 --> 00:01:04,999
And that's just to keep track
of it-- just to make sure

25
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that we don't lose
that 10, we're

26
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putting it into the tens column.

27
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Now we can add all the tens.

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10 plus 30 plus 90, we've
already figured out is 130.

29
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Well the part that is
not a multiple of 100,

30
00:01:18,220 --> 00:01:21,357
we can write in this tens
column-- so the 30 part.

31
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And then the part that
is a multiple of 100,

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we can put in the
hundreds column.

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So we could put the
100 right over here.

34
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Notice, we've just
carried the 1.

35
00:01:29,600 --> 00:01:32,110
But essentially, we've carried
100, because we put a 1

36
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in the hundreds place.

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10 plus 30 plus
90 is 100 plus 30.

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This is equal to 100 plus 30.

39
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That's all we've done.

40
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Now we can add the hundreds.

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00:01:44,300 --> 00:01:49,000
100 plus 500 plus 300 we've
already figured out is 900.

42
00:01:49,000 --> 00:01:51,520
So we can write it as 900.

43
00:01:51,520 --> 00:01:52,390
And we're done!

44
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We've figured out that
500 plus 30 plus 6,

45
00:01:54,640 --> 00:02:02,060
plus 300 plus 90 plus 8, is
equal to 900 plus 30 plus 4,

46
00:02:02,060 --> 00:02:05,215
which is the same thing as 934.

47
00:02:05,215 --> 00:02:07,340
So hopefully this gives
you a little bit more sense

48
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of what we're doing when we
"carry the 1" every time.

49
00:02:09,660 --> 00:02:11,520
6 plus 8 is 14.

50
00:02:11,520 --> 00:02:12,940
We carried the 1.

51
00:02:12,940 --> 00:02:14,347
That 1 represents 10.

52
00:02:14,347 --> 00:02:15,930
It represents this
10 right over here.

53
00:02:15,930 --> 00:02:17,380
Just so we don't
lose track of it.

54
00:02:17,380 --> 00:02:22,940
Then we say that 10 plus
30 plus 90 is equal to 130.

55
00:02:22,940 --> 00:02:25,190
So that's 30 plus 100.

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Then we add the hundreds
together and we get 900.