Lesson video

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Hello everyone, it's miss Sidhu do here today, and we've got some great math to do today.

Before we start I've been doing some artwork.

As you know, I love doing art.

I made an Origami face.

It looks a little bit like Rumpelstiltskin.

Origami is when you fold the paper.

There we go.

Now let's start some maths.

We are going to be learning to add a two-digit number and the ones.

When we add a two-digit number we're going to be learning what does two digit mean, and how are we going to be making a number sentence or an equation using it.

Well today's lesson is lesson number two.

For the topic of addition and subtraction, you will need a paper and a pencil.

There are times when you will have to pause the video to have a go at some of the activities yourself.

Now let's get started.

We are going to look at a quick starting quiz to see what you remembered from yesterday, now number bonds are key vocabulary, which is our star words.

We are going to identify what a two-digit number is creating addition sentences or equations using two-digit numbers and ones, an independent task and answers, and finally a quiz to see what we have learnt.

But before we get ready, I want you to pause the video to complete your start of lesson quiz.

Once you've finished I want you to restart the video.

Star words, star words.

When I do the star words, I'm going to say it first and then it will be your turn to say the word.

Number bonds.

Add Can you show me the sign for add or plus, Subtract.




Seep, and we're going to be using these star words in our math today.

Oh have a look at these numbers.

I can see four different numbers.

Can you help me to see the numbers? 14, 36, nine, and seven.

There's something special about two of these numbers.

Two of these numbers have two digits.

Which numbers have two digits? I want you to pause and freeze and Macaroni cheese, which two numbers have two digits.

How did you get on? Great work, I heard lots of you say the two-digit numbers are the numbers 14 and 36.

All I know that a two-digit number is made up of two numbers.

Like the number 36 has the number three and six.

It has three-tens and six-ones, making it 36.

Also, the number 14, it has two numbers.

It has one-tens and four-ones.

So it has the one and four to make 14.


Now let's see if we can use it to help us with the number equations.

Here we've got an addition equation or a sentence.

45 plus three is equal to? We need to find the answer.


45 is a two-digit number and then we have to add the three-ones.

Now here I've got a bead string showing the number 45 and then the number three.

Remember each colour makes 10 beads, we need to count the bead string so that we can find out the answer.

Let's count the 45.

10, 20, 30, 40, 41, 42, 43, 44, 45.

Now we need to add the three-ones, rather than counting it all over again.

We can count on from 45.

Can you help me to count on.

So 45, 46, 47, 48.


48, did you get 48 as well? Well done.

I wonder if you can help me with the next equation.

Here we've got another addition equation.

25 plus three.

We want to find out what it equals to.

We're going to use the Part-whole model.

We know that one part is 25, and the other part is three.

But we don't have a bead string this time.

Hmm, how else could we count it? I know we could use our brains everybody point to your brain.

We could start with the largest number to help us.

What's the largest number there? Can you shout it out? Can you shout out louder? Great.

25 is the largest number and it's also a two-digit number.

So let's put 25 in our heads, and let's count out three.

Everybody show me your three fingers.

To 25, let's count on three, so 25, 26, 27, 28.

The answer is 28.

So the whole is 28.

Supper, I wonder if we can do another one.

Well, this time, we've got dienes to help us in our part-whole model.


But we haven't got a number equation.

I want you to have a go at writing the number equation, so that we can find out the answer.

I want you to pause the video and think and then I want you to write it down.

How did you get on? Does your equation look like mine? 56 plus three is equal to? Hmm, do you think you could have a go at the answer? Oh, somebody's done the answer.

Let's check if you've got the same answer as me.

So 56, let's put 56 in our heads, and we need to count on three.

So I've got my three fingers ready so 56, 57, 58, 59.

Well done everybody if you've got 59.

If your answer wasn't the same as mine, maybe have a go and check it again.

So 56 plus three is equal to 59.

I wonder if we can have a go another one.

This one might be a little bit challenging.

We've got the equation 35 Plus, oh, something's missing, is equal to 39.

Hmm, we need to find out what the missing part is.

What do we need to do? Can anyone tell me? Oh, I could hear them from here.

I think you're right, we could use that information from the whole and the part to find out the other part.

So we know one part is 35 and the whole is 39.

But we need to find the other part.

I know because one part is 35.

Let's move one part of the 35 to the correct place.

So from our whole of 39, let's move the 35 to the point everybody can you help me? Let's go and move it all the way there.

Ah, so we've got one part and you now we need to move the other part.

Let's move it.

Are you ready? One, two, three, super work.

Everybody did, it's like magic.

So we've got our two parts.

We have 35 and the other part is good everybody shout out.

Oh, can you shout out a little bit louder? Super, four.

35 plus four is equal to 39.

The answer is four.

Great work, everybody.

Thank you for helping.

I wonder if you can help me with one more.

Here we've got our part-whole model and the hole is 47.

Let's check 10, 20, 30, 40, 41, 42, 43, 44, 45, 46, 47.

The whole is 47.

One of the parts if we look at our number equation is something plus 41.

So one of our parts is 41.


But we need to find the other part.

Can you help me? What can we do? Can you shout it out? Is the same as last time.


We've got our whole and we have to split it into the parts.

We know one part is 41.

So let's move 41 to the parts There we go 41 and now we need to move the other part.

Are you ready? Let's.

How many is in the other part.

Can you count with me? I want to hear you say nice and loud.

One, two, three, four, five, six.

So the other part is six.

Hmm, that means the number equation at the bottom is six plus 41 is equal to 47.

Great work, I think you're ready to do some math.

For our independent task you need to look at the two-digit number and then add the ones.

They've have dienes at the top of the equations to help you to make sure you do some counting.

After you finish, then you can check the answer to see if you've got them correct.

If you've got any of them wrong, you need to go back through your work and check.

Let's have a look at the answers now.

I hope you got them all right.


Oh, I've got a challenge for you because he did super well.

Having a look at all of the equations in the dienes, what's the same and what's different? You might want to think about the equations or how they've been written.

You might want to look at the two-digit numbers like we've been learning today.

I want you to tell the person next to you.

Great job everybody.

You might have seen things that are same and things that are different.

It's already the end of the lesson.

Wow, you did some super-duper maths everybody.

Give yourselves a round of applause.

I hope you had lots and lots of fun.

Now, I want you to complete your end of lesson quiz to see how much you remembered.

Now see you tomorrow for some more math.