Fourth Grade - Lesson 1.2 Reading and Writing Numbers
May 19, 2015
Hi everyone. This is Anastasia from PS1 O one, and today we are going to learn how to read and write numbers in standard form, expanded form and word form. Starting with extended form, we're going to choose a 6 digit number. Let's use 372,684. In this number, we have 6 different digits, which represents 6 different place values. You can also see that we have a comma in the middle of our number. That is because after every three digits that you write in standard form, you're going to use a comma to represent a period. So our first period 684 is our one's period. Our second period 372 is our thousands period. Every period will have a hundreds, tens, and ones place. Looking at this number, the greatest place value position in the thousands period is a 100,000s place. Which is represented by a digit three, followed by the 10,000s place and the thousands place. In our first period, the first period, our greatest place value position is the hundreds represented by the 6, followed by the tens and the ones place. Now we're ready for expanded form. Once we understand our place value, we are able to break this number apart using expanded form. And using our knowledge of place value. We will also be connecting these numbers using the addition symbol. We will always start with the greatest place value in our number, which in this case is the 100,000s place. So I'm going to take the three from the 100,000s place, and write it down on my line. Now this three represents three, 100,000, which is the same as three times 100,000, which equals 300,000. So I will write 300,000 on my line. With my initial symbol, getting ready to connect my next number. I could also take my number, so my next number is the 7 in the 10,000s place, and count how many digits are remaining after the 7th. One, two, three, four. So I could just add my four zeros. One, two, three, four. Giving me 70,000. And I will continue this process until I reach my least greatest place value, which is the four in the ones place. So the reason 2000 plus 70,000 plus 2000 plus 600 plus 80 plus four. And this is what we call expanded form. Lastly, we have word form, which inward form we're going to use just that words. I'm going to use words to express my number. And I'm going to write that number exactly how I say it. So 372,684 will now become Three hundred seventy two thousand Add your comma for the end of your period. six hundred eighty four 600. 84, and this is how you would write word form. Thank you for watching and I hope this helped.