Lesson video

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Hello, my name's Miss Jones, and I'm going to be teaching you math today.

Are you ready? What is a math teacher's favourite kind of tree? Go on, tell me what you think.

Shall I tell you? A math teacher's favourite kind of tree is geometry.

Let's start today's lesson.

Today we're going to be solving word problems about capacity and volume.

Here's the lesson agenda.

We'll start with the new learning where we think about what we already know to do with measure and fractions and amounts, and how we might solve problems using our number bonds.

There'll be a talk task followed by an independent task, and then finishing off with a post quiz.

You will need a pencil and some paper for today's lesson.

Please pause the video now and collect these items if you haven't done so already.

There are many ways to solve problems, so it's good to think about the way that you find it the easiest.

First of all, I want you to think about what do I know about addition and subtraction within 1000? What do I know about fractions? What do I know about measure? I'm going to pause to give you time to think about these questions.

Let's look at a word problem together.

Tom needs to fill a fish tank up.

The tank has a capacity of 90 litres.

He has poured 60 litres of water into the tank.

How much more can fit in the tank? To help us we need to think about what we know about the problem.

So what do you know about the problem? What do you not know? What bar model could you draw? I'm going to pause while you think about those questions.

Here are a few more questions before we go through it together.

What operation is required to solve this problem? Do you need to use a written method or can I use known facts? How do you know? Pause the video whilst you think about these questions and what the answer might be.

Click resume when you are ready.

Let's solve this question together to find the answer.

We know the capacity of the container is 90 litres.

That's the whole amount here on my bar model.

The other known amount is 60 litres, which is one of the parts.

That's how much Thomas filled up the fish tank so far.

This amount here is what we're finding out for how much is left.

I know nine takeaway six equals three.

So if I know nine takeaway, six equals three, I know 90 litres take away 60 litres equals 30 litres.

And just like I explained my answer to the previous problem, I would like you to do the same using these sentences.

Let's read the question together first.

Jenny has 35 millilitres of orange juice in a glass, and then pours in 55 millilitres of mango juice.

What is the volume of her drink? Whilst you think about the answer to this question, say these sentences out loud.

I could represent this on a bar model by, I know add equals, the volume of the drink is, and here's a bar model to help you draw out in your book.

Click resume when you are ready.

I could represent this on a bar model by having one of the parts being 35 millilitres and the other part being 55 millilitres.

I'm finding the volume, which is the total amount, the whole.

I know that 30 add 50, three add five equals eight and five add five equals 10.

So the volume of the drink is 90 millilitres.

Let's look at another problem together.

If Ms. Jones made a 750 millilitre pot of tea, how much tea is left over if she pours out 300 millilitres into a cup? What might the whole number be? What might the parts be? Can you make an estimate? I'm going to pause to give you time to think.

I know the whole is 750.

I know that Ms. Jones has poured out 300 millilitres, which is one of the parts.

I can estimate the answer because I know that 700 take away 300s would be 400s.

So the answer is going to be around 400.

750 take away 300 equals 450 millilitres.

For your independent task today, you have got word problems similar to the ones that we have practised together.

You could use a bar model to help you as well as using your number bonds and related number facts to help solve the problems. Pause the video to complete your task, resume once your finished, Let's go through the answers.

Question one, Shannon collects two types of medicine for her Grandad.

She collects 40 millilitres of one type and 80 millilitres of another.

How much medicine does she need for her Grandad? To find the amount that she needs all together, we need to add up the two parts.

Shannon needs 120 millilitres of medicine for her Grandad.

I know that eight plus four equals 12, so 80 plus 40 must equal 120.

Question two, Debbie needs 24 millilitres of medicine and Tom needs 45 millilitres of medicine.

How much medicine do they need altogether? Again, I need to add up the two amounts to find the whole.

Altogether, Debbie and Tom need 69 millilitres of medicine.

Question three, Dr.

Milly Litre is making some medicine.

She needs 74 millilitres, but has dropped some on the floor.

The doctor is left with 29 millilitres.

How much does she now need to make, to reach 74 millilitres? In order to find how much she needs, 74 is the whole and one of the parts is 29.

So 74 take away 29 totals to 45 millilitres.

Dr.

Milly Litre needs 45 millilitres to reach 74 millilitres.

And the final question question, question four, Dr.

Milly Litre has got a beaker with a capacity of 55 millilitres.

She has put 33 millilitres of medicine in, how much more can she fit into the beaker until it has reached full capacity? So again, finding the difference between the two amounts, 55 take away 33.

Well, I know it's, I estimate that 50 takeaway 30 is 20.

She can fit 22 millilitres because 55 away 33 is 22 millilitres.

Well done for working hard today.

I hope you've enjoyed the lesson.

Now it's time for you to complete the quiz.

Hopefully see you again soon, bye.