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Place Value Lesson - 1st and 2nd Grade Math

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Hey kids, what's up! Today, we are learning about place value. Let's go and look at the example, so we can start learning. Come on, guys! Let's go! Here, we have what I like to think of as a Place Value House. This is the home of the place values. Over here, we have big brother hundreds, and in this room we have sister tens, and in the last room we have baby ones. Now, in the place value house, we have a rule that says we can only have one digit in each room. Remember that a digit is any number from 0 to 9. In this house we can only have one number or digit in each room. That is the rule, and we have to follow it. So, let's look at this number, and put it in the right place. Here, we have the number 50. The number 50 has two digits in it. The 0 is a digit. And, the 5 is a digit. So, they need to be in separate rooms in the house. So, let's think about how many tens are in 50. We have 5 tens that make up 50. Now, how many do we have in the ones place? We have 0. So, we have 0 ones in the ones place. Let's look at the number 50 using our place value blocks. We know that to get 50, we need 5 tens. 1, 2, 3, 4, 5, and 0 ones. Each one of these tens blocks is made up of 10 ones. If I counted every individual block in these tens blocks, we would see there are 50 of them. Now, what if we move the number 5 over here in the hundreds place. We cannot leave this middle room empty. So, we're going to fill with the number 0. Looking at this number, we no longer have 50 like we did before. Is this number a lot different than 50? With the 5 moving places, we now have 500. To show us this, let's get some hundreds blocks. To get 500, we need how many hundreds blocks? If you said 5, you're correct. We need 100, 200, 300, 400, 500. If we compare 500 to 50, we can easily say that 500 is a lot more than 50. So, a 5 in the hundreds spot is a lot bigger than a 5 in a tens spot. It's very important to pay attention, to which part the numbers are in, because, this changes the value of a number. Let's look at another one. This is the number 6. And, it is in the ones room. If we represent this number with blocks, we would have 6 ones blocks. So, we have 6 in the ones place. But, what if we move the 6 to the tens place. Does that change anything? We can see the difference between the 6 in the ones place and 6 in the tens place by using the blocks. Here, we have the 6 ones. And, here we have the 6 tens blocks. As we can see, there is a big difference between 6 in the ones and 6 in the tens. The 6 in the tens place has a value of 60. And, the 6 in the ones place has a value of 6. Remember that we need to pay attention to what place the numbers are in. Now, let's move the 6 over to the hundreds spot. And, see if this has a different value. So, can you tell me what number this is? The number is 600. Great job, guys! We had the 6 in the tens place which gave us 60, but, now it is in the hundreds place which gives us 600. Is 600 worth more than 60? It is worth more than 60. Our blocks can show us this. Each of these hundreds blocks represent 100 of the ones blocks, and 10 of the tens blocks. Having the 6 in the hundreds place is definitely a lot bigger than a 6 in the tens place. We have time for just one more number to look at. In this one we have two digits. This is the number 27. To look at this number with the blocks, we would have how many tens blocks? 2 tens blocks, correct! How many ones blocks? We have 7 ones blocks. Good job. We have 2 in the tens place, and, 7 in the ones place, which gives us 27. But, what if we move these numbers over to the next room? Let's do that and see what we have. We no longer have 27. What number is this? We have the number 270. Is the value of 270 bigger than 27? Yes, it is a lot bigger and we can see that with the blocks. To get the 2 in the hundreds place we need 2 hundreds blocks. And, to get the 7 in the tens place we need 7 tens blocks. And, we have 0 on the ones place. So, remember that when the numbers are in different places, they have different values. And, knowing this will help you understand the difference between large and small numbers. Thanks for watching, guys! We will see you next time.

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Duration: 5 minutes and 25 seconds
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Language: English
License: Dotsub - Standard License
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Views: 36
Posted by: pgtranscribes on Apr 20, 2015

Place Value Lesson - 1st and 2nd Grade Math

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