## Subtracting Decimals

• 0:01 - 0:07
We need to calculate 9.005 minus
3.6, or we could view it
• 0:07 - 0:13
as 9 and 5 thousandths
minus 3 and 6 tenths.
• 0:13 - 0:16
Whenever you do a subtracting
decimals problem, the most
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important thing, and this is
true when you're adding decimals as well,
• 0:18 - 0:21
is you have
to line up the decimals.
• 0:21 - 0:32
So this is 9.005 minus 3.6.
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So we've lined up the decimals,
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to subtract.
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Now we can subtract.
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So we start up here.
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We have 5 minus nothing.
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You can imagine this 3.6, or
this 3 and 6 tenths. We could
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add two zeroes right here, and
it would be the same thing as
• 0:48 - 0:53
3 and 600 thousandths, which is
the same thing as 6 tenths.
• 0:53 - 0:54
And when you look at it that
way, you'd say, OK, 5 minus 0
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is nothing, and you just
write a 5 right there.
• 0:57 - 0:59
Or you could have said, if
there's nothing there, it
• 0:59 - 1:01
would have been 5 minus
nothing is 5.
• 1:01 - 1:04
Then you have 0 minus
0, which is just 0.
• 1:04 - 1:08
And then you have a 0 minus 6.
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And you can't subtract
6 from 0.
• 1:10 - 1:13
So we need to get something into
this space right here,
• 1:13 - 1:15
and what we essentially are
going to do is regroup.
• 1:15 - 1:21
We're going to take one 1 from
the 9, so let's do that.
• 1:21 - 1:25
So let's take one 1 from the
9, so it becomes an 8.
• 1:25 - 1:27
And we need to do something
with that one 1.
• 1:27 - 1:29
We're going to put it
in the tenths place.
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Now remember, one whole
is equal to 10 tenths.
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This is the tenths place.
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So then this will become 10.
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Sometimes it's taught that
you're borrowing the 1, but
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you're really taking it, and
you're actually taking 10 from
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• 1:44 - 1:47
So one whole is 10 tenths, we're
in the tenths place.
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So you have 10 minus 6.
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Let me switch colors.
• 1:51 - 1:53
10 minus 6 is 4.
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there, and then you have 8
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minus 3 is 5.
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So 9.005 minus 3.6 is 5.405.
Title:
Subtracting Decimals
Description:

U03_L2_T1_we2 Subtracting Decimals

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Video Language:
English
Duration:
02:08
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