0:00:00.000,0:00:05.400
So we need to figure out what 46 plus 43 is.

0:00:05.400,0:00:06.825
Let me write it down again

0:00:06.825,0:00:11.733
and I'll write it like this: 46 plus 43.

0:00:11.733,0:00:13.554
What we do here is

0:00:13.554,0:00:15.336
we just first look at the ones place

0:00:15.336,0:00:17.856
We literally have 6 ones plus 3 ones

0:00:17.856,0:00:21.118
or you could say 6 and 3, and 6 plus 3 is just 9.

0:00:21.118,0:00:25.221
6 plus 3 is 9, so we have 9 ones.

0:00:25.221,0:00:27.000
And then you go to the tens place

0:00:27.000,0:00:28.267
and there's two ways to think about it.

0:00:28.267,0:00:34.200
You could view this as 4 plus 4 is equal to 8

0:00:34.200,0:00:36.241
but really, the reality of what we're doing

0:00:36.241,0:00:37.969
since we're operating in the tens place

0:00:37.969,0:00:42.067
this is really 40 plus 40 is equal to 80.

0:00:42.067,0:00:44.267
And we could do the same problem expanded out.

0:00:44.267,0:00:48.559
This is the same thing as 40 plus 6.

0:00:48.559,0:00:49.898
We've seen this before, right?

0:00:49.898,0:00:51.600
That's what 46 is.

0:00:51.600,0:00:58.533
And then 43 is the same thing as 40 plus 3.

0:00:58.533,0:00:59.933
We've expanded these out before.

0:00:59.933,0:01:01.533
And so when you add them

0:01:01.533,0:01:06.333
when you add a 6 plus a 3, you get a 9.

0:01:06.333,0:01:11.262
When you add a 40 plus a 40, you get an 80.

0:01:11.262,0:01:14.436
So you get 80 plus 9, which is 89.

0:01:14.436,0:01:15.800
And the whole reason why I did this is

0:01:15.800,0:01:17.195
I wanted to show you that

0:01:17.195,0:01:19.831
when you're adding 4's in the tens place

0:01:19.831,0:01:21.667
you're really adding 40's.

0:01:21.667,0:01:23.600
The fact that it's in the tens place represents--

0:01:23.600,0:01:25.867
or the fact that the 4 is in the tens place

0:01:25.867,0:01:27.518
shows that it represents 40.

0:01:27.518,0:01:29.231
The fact that the 8's there

0:01:29.231,0:01:31.898
shows that it represents 80.