Hello year two students. My name is Ella and I’ll be your teacher today and believe it or not we
are up to lesson 12. So let's get going. What will we need? Well, today we're going to need
a pack of cards and our hundreds, tens and ones. Remember we made them last lesson. Our hundreds,
tens and ones. Okay, let's have a think about last lesson. Our lesson was called, 'Ten of these
is one of those' and we learnt through our base 10 game, and I hope you had fun doing that,
that 10 of these is one of those. 10 tens is 100.
Okay, now let's start with a warm up number talk. It's about place value.
So let's have a look at today's place value. (Pointing to display board) Here's our hundreds
and our tens and our ones. My first question is what is this number? Let's have a think. Okay,
I think we should start at our hundreds and let's see, I can see this by subitising. I can see that
I’ve got a three and a two or a whole group of five. So I’m going to write underneath,
I have 5 hundreds. How many tens do I have? Once again, by subitising, I can see a row of five
and I can see two. I know that five and two makes seven. I have 7 tens and for my ones,
nice and easy, two and two or a group of four. I have 4 ones. So my number today is 574.
Well done! I think there's two other ways to write this number.
So let's have a think. I could write it (thinking) I have 500, I have 7 tens,
(70) and I have 4 ones. So another way to write 574 is 500 + 70 + 4 or 500 and 70 and 4. Another
way I could write this is by using the words I have in front of me. So I can write 5 hundred,
I can have 7 tens and I have
4 ones. These are two ways of representing this number. You might think of something else as well.
Okay, my last question for you is, what if I change some things around? So,
what if I took away 1 one? What will my number be? Let's have a think. 574
take away one. We also might write this as, what is one less than 574? One less than 574
is, I can see it there (points to ones column on display board). I’ve taken one away = 573.
My last question for you today in our number talk is, what if I took away
2 tens (points to tens column on display board)? What if I took away 2 tens or
twenty? What if I took that away, what would my number now look like? Let's have a think. 574
take away 2 tens (20) (Pointing to display board) two tens is five hundred and five, four.
Five hundred and fifty four (574-20=554). Well done!
Okay, today's learning intention is, we're going to represent and make some three-digit
numbers. We're going to use our randomizer today to help us pick some numbers to make,
draw and write and we'll know we can do this,
when we can model our three digit numbers and understand the parts of each three digit number.
So, to start with we'll need a place value match. We drew one last lesson,
but let's have a look at how we did that, because we may need to draw some more.
So I started with (demonstrates on display board) a rectangle
and I needed one line for our headings. I don't need a line right in the middle, but I need one
to the side and to the side, and that will give me three parts. These are our hundreds,
these are our tens and these are our ones. I hope you remember drawing that from last time.
Okay, so what I need in my ones is my beautiful ten frame. My ten frame is a rectangle
divided in the middle. Think about the middle and go just below it, to make my first
two three and four. Let's check, because sometimes we make too little or too much.
One, two, three, four, five and five. Five and five make ten. That's my ten frame.
Okay, we're ready to randomize a number, a three digit number which will have hundreds, tens
and ones in it. Let's have a look. Here's our first number. We have our hundreds,
tens and ones and randomly, we had found a number. 2 hundred, 1 ten and 5 ones. How do we say this
number? I think I can hear that, two hundred and fifteen. Okay, let's make our number two hundred
and fifteen and we'll start with our hundreds. Two hundreds. (demonstrates) two hundreds.
How many tens? One. One ten. How many ones? Five ones. So, I have been able to make my number
two hundred and fifteen. 2 hundreds, 1 ten and 5 ones. I’ve made it, now I need to draw it.
So, I’ve had a go at that myself. Here is my making place value mat
and here is my drawing of my place value mat. Two hundreds, one ten, five ones,
makes two hundred and fifteen, partitioned, is 200 + 10 + five. So there's my recording.
Remember we've randomized it, we've made it, we've drawn it and we've written it. Okay, well done!
Now let's make another three digit number with our most magnificent randomizer.
I’m going to flick backwards and forwards and ins and outs and make a few different numbers
and we'll go backwards.
What have we got? A 5, a 2 and a 3. How do we say this three digit number? We say
five hundred, twenty, three. Five hundred and twenty- three. All right, let's make it.
How many ones? How many hundreds? Here we go. 5 hundreds, (counting) one, two,
three, four, five. Five hundreds. How many tens? 2. Two tens and how many ones? 3. Three ones.
Okay, we've made our number.
That's right. Now we're going to draw it. I’ll draw this one with you. So, here we have a
smaller place value chart I can draw in my book. (Pauses while drawing on display board).
Hundreds, tens, ones and to draw what I have made, I’m going to draw 1, 2, 3, 4, 5.
Five hundreds. 5 hundreds. 2 tens.
Two tens and three ones.
I’m still going to use my tens chart and this will help me remember that 10 of these,
is one of those. How many do I have in here? I have three. (Presenter pointing)
Make it, draw it. Now let's write it. We have five hundred and twenty-three.
523. A bit squishy and I also want to write it as a partition. So I’m going to write 500 + 20 + 3.
I think your challenge will be to make it a little bit less squishy than mine. Okay, well done!
Let's try one more on the magnificent randomizer. So,
I think I will try and pick some different numbers (selects random numbers).
Let's try this one. So we have
three in the hundreds, six in the tens and eight in the ones and this number is,
three hundred and sixty-eight. Let's make it. 3 hundreds,
6 tens
and 8 ones. I think that's going to almost fill up my 10 chart.
There we go. What a beautiful number. 368.
Remember we're going to make it. You'll need to draw it and then write it.
Off you go (press pause).
Let's reflect now. We've learned lots about three digit numbers. We've learned how to make it,
draw it and write it. Let's have a look at an example. This is what Laura drew. So,
she must have made it, drawn it. Let's see what we can write. We've got one, two, three, four.
I can recognize that as subitised four, two and two. So I’m going to write four as my hundred.
Two, two and one. So I can see that that is 5 tens and let's have a look at our ones.
So, I have five and two. My ones is seven. Laura drew the number 457. If I partition
the number 457, I’ll come up with 400 + 50 + 7. Well done Laura that's a beaut number.
Now what's your task today? You might remember I mentioned a pack of cards. So,
what I'd like you to do, is find your cards, but pull out these numbers, we won't need them today.
We won't need our jokers, we won't need our picture cards and we won't use our tens.
So, now I’ve got those pulled out from the pack, I’m going to use the rest of my pack
to make some three-digit numbers. Let's try. I wonder if you're any good at shuffling.
Sometimes I shuffle this way, sometimes I put them out and mess them up. Let's play the game.
So I’m going to deal three cards. A five, a nine and an ace. Let's use ace as a one.
Okay, what have I got? I’ve got 5 hundreds, I’ve got 9 tens and I’ve got 1 ones. So this number is
591. I’m going to make it, I’m going to draw it and I’m going to write it.
Your task is to finish the pack of cards or fill up a page
of our place value game and our three digit numbers. It's great practicing.
I hope you enjoy it. Go ahead you powerful mathematicians and I will see you next time.