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00:00Today, we're going to go over how to identify a number using place value blocks, then you'll
00:05have a chance to practice on your own.
00:07Let's say you're given these place value blocks and asked to identify the number.
00:11Well, you could start by counting up these small blocks on the right.
00:15We call these 1s, and can count that there's 1, 2, 3, 4, 5, 6, 7, 7 1s, or a total of 7
00:23blocks.
00:24Next, we can look at these tall rods.
00:26Well, if you look at just a single rod, you can see that it's made up of 1, 2, 3, 4, 5,
00:326, 7, 8, 9, 10 blocks.
00:35For that reason, we call these rods 10s, and we can count that we have 1, 2, 3, 4, 5 of
00:42them, or a total of 50 blocks.
00:46Next, we can move to these flat squares.
00:48Well, if you look at just one square, you can see it's made up of 1, 2, 3, 4, 5, 6,
00:567, 8, 9, 10 10s.
00:59What is 10 10s equal to?
01:01Well, 10 10s, or 10 times 10, is 100.
01:06There are 100 blocks in each of these squares, so we call them hundreds.
01:10We can count that we have 100, 200, 300, 400, or a total of 400 blocks.
01:17Finally, you can look to these big cubes.
01:20Well, if you look at one cube, it's made up of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 hundreds.
01:29What is 10 hundreds equal to?
01:31Well, 10 hundreds, or 10 times 100, is 1,000.
01:36Each of these large cubes is made of 1,000 blocks, so we call them thousands.
01:41We can count that we have 1,000, 2,000, or a total of 2,000 blocks.
01:47So to identify what number all of these represent, we just add up the pieces, 2,000, plus 400,
01:54plus 50, plus 7, for an answer of 2,457.
02:00Let's do one of these together.
02:02Here are some place value blocks, and I want to start by counting these small ones.
02:06What place value do these represent?
02:09These blocks are called ones, and I have 1, 2, 3, 4, 5, for a total of 5 blocks.
02:16Next, let's count these rods.
02:18What place value do the rods represent?
02:20Well, each rod has 10 blocks.
02:23These are tens, and we have 1, 2, 3 tens.
02:27What is the value of 3 tens?
02:293 tens has a value of 30 blocks.
02:33Now let's move to these flat squares.
02:36What place value do they represent?
02:38These flat squares are 100s.
02:41Each one has 100 blocks in it, and we can count that we have 1, 2, 3, 4, 5, 6, 7.
02:48What is the value of 7 hundreds?
02:517 hundreds is a total of 700 blocks.
02:55Finally, let's go to these large cubes.
02:58What place value do these represent?
03:01These are thousands.
03:02Each one is made of 1,000 little blocks.
03:05And so we can count we have 1, 2, 3 thousands.
03:09How many blocks is that?
03:113 thousands is a value of 3,000 blocks.
03:15When you add together all of these pieces, what number do you have?
03:20When you add these all up, you get 3,735.
03:25Now it's time for you to practice some of these on your own.
03:28What number is represented by these blocks?
03:31Well, we can count starting with our small blocks, our 1s.
03:35We have 1, 2, 3, a value of 3.
03:38Then we move over to our 10s.
03:40We have 1, 2, 3, 4, 5, 6 10s, or a total of 60 blocks.
03:46Then we move over to our hundreds.
03:48We have 1, 2, 3, 4, 5.
03:515 hundreds is 500 blocks.
03:53Finally, we move to our thousands.
03:56There's only 1,000, or a total of 1,000 blocks.
03:59When you add these up, 1,000 plus 500 plus 60 plus 3, you get 1,563.
04:07Now here's your last problem for today.
04:09What number is represented by these blocks?
04:12Well, we can start over here with our 1s and count.
04:15We have 1, 2, 2 blocks.
04:18Then we move over here to our 10s.
04:20We have 1, 2 10s, or a total of 20.
04:23Then we move over to our hundreds.
04:26These are hard to count, but we have 1, 2, 3, 4, 5, 6, 7, 8, 9.
04:329 hundreds is 900 blocks.
04:34Finally, we move over to our thousands.
04:37We have 1, 2, 3, 4, 4,000.
04:41When you add these all together, you get 4,922.
04:47From today, remember, when you're counting up place value blocks, count up each place
04:52value individually.
04:55Only after you've done that should you add all of the place values together.