00:01
We're being asked to subtract 8 ,153 minus 3 ,978.
00:06
Well, to do this, we're going to set this problem up vertically.
00:09
So what i will have is 8 ,153 minus 3 ,978.
00:16
And remember, we're going to start with the ones column.
00:19
Well, we're being asked to take 8 away from 3, which we can't do.
00:23
We don't have enough.
00:24
So what we're going to do is we're going to borrow 110 and add 10 ones to our ones column.
00:29
Well, we already had three ones, so if we add 10 more, then we'd be left with 13.
00:35
Now, because we borrow the 10, now we're only left with 4 tens.
00:40
But now we can subtract in our 1s column.
00:42
We have 13 minus 8, which is 5.
00:45
Now we move on to our 10s column.
00:47
Well, we're being asked to take away 7 from 4, which we can't do.
00:51
We don't have enough.
00:52
So what we're going to do is we're going to borrow 100 from the 100s column and add 10 -10s to the tens column.
01:01
So if i add 1010s to the four tens i have, then i will have 14 tens.
01:07
Now remember, if i take away one of those hundreds, as you can see, i will have zero hundreds remaining.
01:13
However, i can now subtract in a tens column.
01:16
14 minus 7 is 7.
01:18
Now we move on to the hundreds column...