0:00:00.715,0:00:06.990
We need to calculate 9.005 minus[br]3.6, or we could view it

0:00:06.990,0:00:13.067
as 9 and 5 thousandths[br]minus 3 and 6 tenths.

0:00:13.067,0:00:15.800
Whenever you do a subtracting[br]decimals problem, the most

0:00:15.800,0:00:18.063
important thing, and this is[br]true when you're adding decimals as well,

0:00:18.078,0:00:20.573
is you have[br]to line up the decimals.

0:00:20.573,0:00:31.877
So this is 9.005 minus 3.6.

0:00:31.877,0:00:34.863
So we've lined up the decimals,[br]and now we're ready

0:00:34.863,0:00:36.867
to subtract.

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Now we can subtract.

0:00:38.667,0:00:40.133
So we start up here.

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We have 5 minus nothing.

0:00:41.533,0:00:44.582
You can imagine this 3.6, or[br]this 3 and 6 tenths. We could

0:00:44.582,0:00:47.867
add two zeroes right here, and[br]it would be the same thing as

0:00:47.867,0:00:52.600
3 and 600 thousandths, which is[br]the same thing as 6 tenths.

0:00:52.600,0:00:54.335
And when you look at it that[br]way, you'd say, OK, 5 minus 0

0:00:54.335,0:00:57.267
is nothing, and you just[br]write a 5 right there.

0:00:57.267,0:00:59.000
Or you could have said, if[br]there's nothing there, it

0:00:59.000,0:01:00.743
would have been 5 minus[br]nothing is 5.

0:01:00.743,0:01:04.467
Then you have 0 minus[br]0, which is just 0.

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And then you have a 0 minus 6.

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And you can't subtract[br]6 from 0.

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So we need to get something into[br]this space right here,

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and what we essentially are[br]going to do is regroup.

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We're going to take one 1 from[br]the 9, so let's do that.

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So let's take one 1 from the[br]9, so it becomes an 8.

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And we need to do something[br]with that one 1.

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We're going to put it[br]in the tenths place.

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Now remember, one whole[br]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[br]you're borrowing the 1, but

0:01:39.242,0:01:41.200
you're really taking it, and[br]you're actually taking 10 from

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the place to your left.

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So one whole is 10 tenths, we're[br]in the tenths place.

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So you have 10 minus 6.

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Let me switch colors.

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10 minus 6 is 4.

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You have your decimal right[br]there, and then you have 8

0:01:55.821,0:01:58.533
minus 3 is 5.

0:01:58.533,0:02:02.533
So 9.005 minus 3.6 is 5.405.