Lesson video

Hello everybody, it's Miss Sidhu here.

I'm so excited for the math today.

I think we should get straight stuck in.

Today we're going to be solving problems in context using addition and subtraction.

So, using all of the information that we have learned.

This lesson is Lesson 10 for the topic of "Addition and Subtraction".

You will need a paper and 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.

Today we are going to look at some key vocabulary, our star words, identifying if the equation is addition or subtraction, choosing a strategy to solve the problem and working out the answer or which equation we need, an independent task and looking at the answers, see if we've got them correct.

And finally a quiz to see what we have learned.

Now, I want you to pause the video to complete the knowledge quiz.

If you haven't already, then I want you to restart once you have finished.

Let's start with our star words.

Star word! Star words! I'm going to say the star word first, and then it'll be your turn.

Add, subtract, total, value.

Today we're going to begin the lesson with a brain teaser.

Here we have some addition equations that need completing.

Can you have a go at completing these addition equations? I want you to calculate the missing numbers.

I want you to pause the video, have a think and write down the answers.

Let's see how you get on.

Wow.

How did you get on? Did you find the pattern? I found out that once I had worked out the first three, I could use this information to fill in the missing numbers on the remaining three equations.

Can you shout out the answers as I read the equations? I need you to check that and I made sure that I've added it correctly.

Okay, let's begin with the first.

14 plus seven is equal to? I need you to shout it out nice and loud.

21.

14 plus nine is equal to 23.

What about the next missing number? 14 plus eight is equal to 22.

What's the next? 21 is equal to seven plus 14.

23 is equal to nine plus 14, and 21 is equal to seven plus 14.

Good job, everybody.

I like that we're doing simple math and we've warmed up our brains.

Now, I have another exciting lesson for us today.

MM Comics have decided to start their own set of superhero cards, but they need your help.

They know how much you like superheroes and how great you are at counting.

And they've asked if you could help them out.

Everybody show them your super sign.

Superhero sign.

Wow, got such good superheroes in front of me.

Now, each superhero has a set of skills, this must total to 20.

This means that all the numbers added together have to equal to 20.

Just like this card, six plus six is equal to 12.

And another eight is then equal to 20.

Remember on the superhero cards, have a look at their skills.

So, there's strength, speed, that's how fast they are.

The strength is how strong they are, and their intelligence.

So, you'll be thinking about their brain and what they know.

This means that we need your help in creating superhero cards for the comic shop.

Can you tell me if you want to help? Wow, I love how everybody wants to help make some superhero cars for the comic shop.

The comic shop has got a few problems with some of the superhero cards they've already made.

Like this one.

Can you take a look and see what is wrong with it before the comic book opens and tries to sell them? Have a look at Capeman.

Strength is six, the speed is seven and the intelligence is nine.

I want you to have a think.

And I want you to pause the video.

Have a think and tell the person next you what is wrong with this.

Did you manage to find anything wrong? You did? Can you shout out if you did? Well done.

Okay, can you explain it to me? So, I can help fix it before a customer wants to buy it.

Okay, let's see if I have it right.

So, six plus seven plus nine doesn't equal to 20.

Oh no! And all the cards needs to equal to 20.

Thank you for helping me.

So what can we do then? Great idea.

Let's use a number line to help us.

Okay, so I think we need to begin on the number 20 because we know that's how much we need to have altogether, and work backwards.

What do you think? Super right.

Now let's circle the number 20.

Okay, so the strength.

Where's the strength? Can you point to the strength? It's the number six.

So, the strength of the superhero is six.

So, let's jump backwards six spaces.

Are you ready? Can you point to the number line with me? One, two, three, four, five, six.

You can tell me what number we've landed on.

Well done, we've landed on the number 14.

Okay, so the work isn't over yet.

We need to carry on subtracting the skills amount.

So, we know what we have is left.

Okay, so now we need to take away this speed.

Let's have a look at the speed.

How many do we need to take away? Can you point to the number? Seven, super.

Now let's take away seven.

Can you do seven jumps with me? You ready? Go.

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

So, we've landed on the number seven.

That means that we only have seven points left for our intelligence.

But on the card, it says the number nine which means is too many.

We need to change it.

Let's change this and make the card ready for the comic book shop.

Everyone let's rub up the number nine.

Let's put a number seven.

Super.

Great work, everyone.

So let's have a check.

Six plus seven plus seven is equal to 20.

Great work, everyone.

I think we can have a go at another one.

Oh no, the comic book shop has found another problem and needs our help again.

Here is a superhero card that is incomplete, which means it cannot be sold.

We need to work together to complete this card.

Now, who can remember what number each card needs to make? Can you shout it out? It needs to make the number 20.

Well done.

So what should we do? I think you're right.

Let's add these two numbers together.

How could we add them? I know we could put the number eight in our head, and then we can count on four fingers to see the number.

Let's do it together.

So, put eight in our head, count on four.

So, eight, nine 10 , 11, 12.

Super.

So, this superhero has used 12 points so far.

Because we know that eight and four make 12.

How many do we have left for the intelligence? We could use addition or subtraction to find this information out.

We could either start at 20 and count backwards or we could start from 12 and jump forwards, once counting until we get to 20.

Which one shall we try, addition or subtraction? Do you want to shout out which one should we try? I heard lots of you say addition.

Super, let's try that one.

Okay, so we've got our number line, and we need to start on the number 12.

So, let's circle the number 12.

And we need to find out how many jumps we do until we get to the number 20.

So, everybody point to the number 12.

Let me see if everybody's ready.

And we're going to count together.

I want to hear you nice and loud counting the jumps up to 20.

You might want to count with your fingers too.

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

Super.

That means we have eight points left for the intelligence part of the superhero.

So, let's write the number eight in the intelligence part.

So, it will 12 plus eight is equal to 20.

Great work, everyone.

The comic bookstore are super, super pleased for your hard work of sorting out these cards.

Well, let's see.

We've got one more challenge before the comic bookstore can open to its customers.

Here we have a superhero card for Blobman.

But there are some missing numbers.

Everybody show me Blobman with your hands up.

Super.

What combination could we put into the two empty boxes? Remember, the card has to equal to 20 points altogether.

So, remember it needs to total to 20.

I want you to pause the video and use the number line to help you work out the two numbers.

And for this one, there are many different answers.

So have a pause, have a think.

And then I want you to tell the person next to you.

How did you get on? Have you managed to find some of the numbers for the two empty boxes for the strength and the intelligence? Okay, let's have a look together.

So, I need you to come and help me.

Okay, we need to make sure this card is ready for our comics bookstore.

Okay, so let's do this together.

So, we know the total is 20, and we've got the speed which is eight.

So, we need to make eight jumps backwards because we've already know the total is 20.

And we've already used eight.

So let's do our eight jumps.

Can we count with me? One, two, three, four, five, six, seven, eight.

I can see we have been left with the number 12.

Okay, so if I use the part-whole module, I already know the whole I am working with is 12.

Because I need to know different ways of making 12 so I can fill in the empty two boxes on my superhero card.

I can create many different ways of making 12.

Can you think of any ways to make 12? Two numbers that add together to make 12.

Can you shout them out to me? Well, I can hear some.

Remember they have to make 12.

Whoo, I like it.

Five plus seven makes 12.

Great.

I heard two plus 10 makes 12.

And I even heard eight plus four.

Another one I just heard, six plus six.

Great work, everybody.

You know so many different ways to make 12.

I like the six plus six.

Now I can add six plus six.

I can add the numbers to the skills of the superhero and complete the card.

Super work, everybody.

I love that we're making different numbers to add to 20.

Now, I think you are ready for your independent task.

You have to complete the superhero cards like we did before.

We've got the number six for Blobman and number nine for Capeman.

Remember, you can only use 20 points.

So, the total has to be 20.

Use the number lines to help you to count, like we did before.

I hope you have some good counting and do using lots of jumps in the number line.

Remember the total has to make 20.

Here are some of the possible answers for Blobman.

Having a look if you've got the same? Good counting.

Let's check all the possible answers for Capeman.

Remember, we've already got the nine.

Super work, everybody.

I love how you're doing amazing work.

You definitely can help the comic bookstore again.

I hope you had lots of fun and well done for all the super learning today.

Now I want you to complete the End of lesson quizzes, everything that you had remembered.

And I will see you tomorrow.

Okay, bye.