Lesson video

Writing equations to show comparison part one.

Hello everybody, I'm Miss Sidhu and we are going to be doing some wonderful maths today.

In this lesson, you will be writing equations to show the difference between numbers and objects.

Now, I hope you're ready to start the math.

Let me see a thumbs up.

Now let's get started.

Welcome to today's lesson ,today we are learning to write equations using the plus sign or add sign.

Can you show me add, do a nice straight line, add.

And to write equations using the minus sign or the takeaway or subtract, show me subtract.

We're going to do an independent task and also an end of lesson quiz to see everything that we have learned.

You will need a pencil and paper and a number line to help you.

There are times in the video where you may need to pause and have a go at some of the activities yourself.

Now, let's begin.

Hello, everybody.

Now, we need to begin this lesson by doing a quick brain teaser.

Let me see who's ready.

I want you to shout out the answers to these equations.

So, we've got some equations from the boy and from the girl.

I want you to say the answer to the equations.

So, pause the video, have a think and then tell the person next to you the equation answers.

How did you do? So, two plus three is equal to five.

Four plus three is equal to seven.

Three plus three is equal to six.

Wow, I love how all of you did a super quick.

Give yourselves a fantastic.

Now, let's have a look at these children lining up.

Some have a partner but some do not have a partner.

The girls should be lined up against the boys.

Let's find out how many girls don't have a partner.

What equation can we write to show this? The first thing we need to do is count the girls.

Let's count them.

One, two, three, four, five, six, seven there are seven girls.

Now, let's count the boys, one, two, three, four, five there are five boys.

What equation could we write to show this? I know, we could write a subtraction equation.

Everyone show me the sign for subtraction.

Another way of saying subtract is minus.

So, let's think how many girls did we have? Seven.

Remember, when we do a subtraction equation, the biggest number goes first.

Seven minus five boys is equal to, let's use our fingers to help us find the answer to seven minus five.

Now, everybody show me seven fingers.

So, I've got my five, six, seven.

Now, we need to take away five.

So, there's my five, one, two, three, four, five, take away my five, that means how many do we have left? That means, we should be left with two.

So, seven minus five is equal to two.

Now, how could you change the equation from a subtraction equation to an addition equation? We already know the information but how can we arrange it into an addition sentence? Let's try it together.

So, here is the information we know there are seven girls and five boys.

And there's a difference of two so, let's put this information into an addition equation.

You've got seven girls, you've got five boys, and there's a difference of two.

So, we need to put in the addition equation, so, we've got five boys, add the two missing because remember, the two girls don't have partners.

So, we've got two, let's put it there.

And then, to make it equal to the girls, we've got seven.

So, remember there's two boys that are missing because remember, the two girls don't have partners.

So, all together we need seven to make it equal.

To this five boys, add the missing two is equals to seven, so, that's the same as the girls.

Now, let's try using cubes now.

Here, I have four cubes.

And here I have one, two, three, three cubes.

What equation could we write to show this? I want you to pause the video and have a go.

How did you do? We could create an addition equation.

So, if I need to find-- So, there's one more yellow cube to make it the same as the blue cube.

So, I've got plus one and then I've got four blue cubes all together, so I need to make them the same to get to four.

And I've already got three cubes so I've got three plus one cube is equal to four, so it will make the same.

So, both sets of cubes will be four, so they'll be the same same matchy matchy.

Or we could create a subtraction equation.

This time remember we've got the difference that equals to one, but we need the two numbers to equal one.

What would the first number be? Let's see if you're right.

Four minus, what do you think the next missing number is? Three well done.

Four minus three is equal to one.

Wow, I think you're ready for today's independent task.

I want you to draw lines to show the partners and matching the boys with the girls, and how many pupils don't have a partner.

You can write an equation to show this.

So, I want you to write an equation.

So, here we have our subtraction equation.

There are four boys and two girls.

Can you write a subtraction equation? The next one, there are five girls and eight boys.

Can you write an equation? And then for your challenge, there were 11 boys and 15 girls.

I want to draw a picture to show the boys and girls remember matching them up with the line and then to write an equation.

Pause the video to complete your task and resume once you're finished.

There's the answer, we've got four minus two is equal to two.

We've got eight minus five is equal to three.

And we've got 15 girls, 15 minus 11 is equal to four.

Hope you had super fun with finding and solving the problems. If you would like to share your work with Oak National, please ask your parent or carer to share your work on Twitter, Instagram or Facebook tagging @OakNational and #LearnwithOak.

And now, that's the end of the lesson, bye.