# Decimals-Multiply-3 by 3-VIDEO 1

## Math

Hi, class. This is miss champagne, and today I'm going to teach you how to multiply multi digit numbers. We're going to start with 53.58 times 9.35. And as you can see, it is written whole horizontally. All right? When it's written across, it's called horizontal. And you can remember that if you draw a little sun here, a little smiley face, the sun rises and sets on the horizon. That's how you know that this is called horizontal. We are going to write these numbers vertically. And vertically means up and down. This is called ver to color. And I'm going to put 53.58 here. And I'm going to put 9.35 underneath it, vertically. Now, we are going to separate these numbers. So it was easier for us to multiply. If there are three numbers down here, you're going to write 53.583 times. If there are two numbers down here, you're going to write 53.58 twice. If there's one number, then you just write 53.581 time. Since there's three numbers here, I'm going to write 53 .583 times. But I'm going to leave off the decimal until the end. So the very first thing that you do circle all the numbers that are behind the dot. And I see there are one, two, three, four. So there are four numbers all together. Behind the dot. Which is the decimal. So that means in our answer, we're also going to make sure there's four numbers behind the dot or the decimal in our answer. Second thing is go ahead and write 53, 58, three times. 5, three, 5, 8. And don't write them too close together so you have a little bit of space in between each number. Once. 5, three, 5, 8, and 5, three, 5, 8. Again. So we go back to our original example. We see here that a 5 is underneath the 8th. So I'm going to go to the first column and make sure that my 5 is underneath the 8. Then we move over and make sure you write one number in each column at a time. Then we see here that the number three is underneath the 5. So I'm going to go to the second column and make sure that I write a number three underneath that 5. Then I see here that a 9 is underneath the three. So I'm going to go over to my last column and make sure that I write a 9 under the three. Since I already have a 5 here under the 8, I don't need another number here under the 8. So I'm just going to write a zero. And a zero is my placeholder, all I do is bring it down. Over here, I already have a number underneath my 5. I don't need another number underneath my 5. Here, I have a number 5 underneath my 8. I don't need another number. I don't my 8. So these are two zero placeholders that we just bring down and our answer. And if you look at this number, this number, without the decimal, is 935. And we're going to multiply this number by 900 35. So all you're doing is taking this bottom number and writing it in this expanded form. That's what we learned from elementary school expanded form. So 935. So let's start here with the last number. 8 times 5. If you don't remember your 8 times