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# Place value blocks

## Thuyết minh video

what number is shown by the place value blocks so here we have several sets of place value blocks some with many many many blocks and some with just single blocks stacked on top of each other and we want to know what number is represented by all of the blocks combined so let's start over here with the single block stacked on top of each other because it will be the easiest one to count we can zoom in on that a little bit make it easier for us to count and these are just single blocks ones stacked on top of each other so we can count them and we'll see there's 1 2 3 4 5 6 7 8 9 blocks 9 blocks right here then moving over now we have columns of ones and each of these columns here is 9 because 9 is evil even with this other 9 column plus one more is 10 so each of these columns has 10 blocks these are tens how many tens do we have we have 1 2 3 4 5 5 sets of 10 or 50 so we have 50 blocks here plus 9 more in that last column moving over now we have these columns of 10 but it's several columns of 10 stuck together to make sort of like a slab how many columns of 10 are in this slab there's 1 2 3 4 5 6 7 8 9 10 columns of 10 10 rows of 10 or 10 columns of 10 which is a total of 100 so each of these slabs is a hundred and how many slabs do we have we have one and then two a second one back there so we have 200 or 200 and then finally scooting it over a little bit here we have these slabs of 100 these sets of 100 all stacked together so there's one set of 100 here then another set behind it and another and so on so let's count how many hundreds this is we have 100 200 300 400 500 600 700 800 900 and that last one makes it a thousand so these are thousands and how many thousands are there there are one two so two thousand two thousands zooming back out we can look at all of the amounts we had we had two thousand blocks plus two hundred more blocks plus fifty more blocks plus nine blocks or in total we have two thousand two hundred fifty nine blocks moving on to this next one we know what these different sizes represent here this first for this column at the end is ones right beside it these are columns of ten we know those are tens then we don't have any of the hundreds any of the where we had ten sets of ten making sort of like a flat slab we don't have any hundreds in this number but we do have these large cubes made up of many many many small cubes and those are thousands because they were ten sets of a hundred so now let's count we have one two three four five six seven eight ones which is the same as eight plus one two three tens 30 plus know hundreds again but one two three thousands which is three thousand so when we combine these numbers we need to be careful to remember there are no hundreds our number will be three thousand zero hundreds and thirty-eight 3038 is the number represented by these place value blocks for this one I encourage you to pause the video and see if you can figure out on your own what number is represented by the place value blocks and now we can look at it together let's remember this is one's tens hundreds and thousands so looking at our ones we have one two three four ones four ones plus one two tens which is twenty ten plus ten is twenty plus now these hundreds are several hundreds let's see 100 200 300 400 500 600 700 there's seven of the hundreds plus only one of the thousands which will be one thousand and now to combine this to write this all together this will be one thousand seven hundred twenty four is the number shown with these place value blocks