00:01
So in this problem, we're being asked to multiply 3 ,624 by 517.
00:06
Well, when i do multiplication, i always do the vertical method.
00:08
So i'm going to stack them on top of each other.
00:10
So i'm going to put the number with the largest digits first, so 3 ,624, and i'm going to multiply that by 517.
00:18
So the first thing we're going to do is we're going to start by multiplying each number in the top by 7.
00:23
So first, we start with 7 times 4, which is 28.
00:26
So i bring down the 8 and carry the 2.
00:29
Next, we'll do 7 times 2, which is 14, and then we have to add the 2, which would be 16.
00:34
So i got to bring the 6 down, carry the 1.
00:37
Now, we'll have 7 times 6, which is 42, plus 1, which is 43.
00:41
So i bring down the 3, carry the 4.
00:43
And then we'll do 7 times 3, which is 21, plus 4, which is 25.
00:48
Perfect.
00:49
So now we're going to start by doing, multiplying everything by 1.
00:52
So i'm going to cancel out what we carried before.
00:54
And because now we're in the tenth row, we're going to start by putting a placeholder in the next row.
00:59
So now let's multiply.
01:01
So we have 1 times 4, well, that's 4.
01:03
1 times 2 is 2.
01:05
1 times 6 is 6.
01:06
And 1 times 3 is 3.
01:08
Great.
01:09
Now, for our last digit, we have to multiply by 5...