WEBVTT

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Now, let's do the exact
same addition problem

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that we did in the last video.

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

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understand what's
going on when we're

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doing all of this carrying.

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So this 5 is in
the hundreds place.

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So it really represents
5 hundreds or 500.

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3 represents 3 tens because
it is in the tens place.

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So it represents 30.

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And the 6, well, it just
represents 6 ones or 6.

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Likewise, this 3 represents 300.

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This 9 is 9 tens or 90.

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And this 8 just
represents 8 ones or 8.

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And now we can add these two up.

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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,

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

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So let's write the
part that's not

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a multiple of 10 in
this ones column.

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So let's put that 4 there.

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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.

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And that's just to keep track
of it-- just to make sure

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

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putting it into the tens column.

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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.

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Well the part that is
not a multiple of 100,

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we can write in this tens
column-- so the 30 part.

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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.

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Notice, we've just
carried the 1.

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But essentially, we've carried
100, because we put a 1

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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.

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That's all we've done.

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Now we can add the hundreds.

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100 plus 500 plus 300 we've
already figured out is 900.

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So we can write it as 900.

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And we're done!

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

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plus 300 plus 90 plus 8, is
equal to 900 plus 30 plus 4,

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which is the same thing as 934.

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So hopefully this gives
you a little bit more sense

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

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6 plus 8 is 14.

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We carried the 1.

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That 1 represents 10.

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It represents this
10 right over here.

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Just so we don't
lose track of it.

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Then we say that 10 plus
30 plus 90 is equal to 130.

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So that's 30 plus 100.

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Then we add the hundreds
together and we get 900.