Lesson video

Hi there, my name is Miss Darwish and, for our math lesson today, we are going to be talking about pounds and kilogrammes and how to convert between them.

But, before we start, if I could just ask you to take yourself away from any distractions, somewhere where you can work.

So, for the lesson today, we're going to start off by talking about what pounds are basically, and then we're going to be having a look at some conversions, and then we'll be estimating the mass, and then, at the end of the session, there will be a quiz for you to complete on today's learning.

So, for this lesson, if I could just ask you to grab yourself a pencil or a pen, doesn't matter which, a sheet of paper or a notebook, and a ruler.

Ready to start? Let's talk about pounds.

Pounds as a money or pounds as in mass? So, we've got pounds.

When we say pounds, we're talking about Great British pounds in the UK, our currency.

Also, not to be confused with pounds.

So they have similar names but very different signs.

So you've got a pound sign and then the pound, as in the unit of measure.

Usually it's got lb, two letters.

So we are talking about pounds, the unit of measure, not the currency today.

Now, one kilogramme is approximately around 2.

2 pounds.

Can you remember that for me? One kilogramme is approximately, that means we can't use an equal sign, so we're going to use this sign instead because it's not exactly 2.

2 pounds.

So one kilogramme is approximately 2.

2 pounds.

What about two kilogrammes, then? Approximately, roughly, how many pounds is that? So two kilogrammes, in two kilogrammes that means there are how many pounds? 4.

4 pounds.

We're just doubling, aren't we? So we go from one kilogramme to two kilogramme, we multiply by two, or we double from 2.

2 pounds to 4.

4 pounds.

We are doubling or multiplying by two.

Well done, if you got that right.

Let's have a look at this table, then let's have a look at a conversion table.

So, on the left, we've got, which unit, kilogrammes, and then, on the right, we've got our pounds.

So I'm going to give you a few seconds just to read over that and have a look.

So one kilogramme is equal to 2.

2 pounds.

What about 10 kilogrammes? What have we done from one kilogramme to 10 kilogrammes? We've multiplied by 10, and then from 2.

2 pounds, we would multiply that by 10 to give us 22 pounds.

Did you see that? So, if I know that one kilogramme is roughly equivalent to 2.

2 pounds, then 10 kilogrammes is approximately the same as 22 pounds.

What about three kilogrammes, then? What do you think it is? So, from one kilogramme to 3 kilogrammes, if I do 1 X 3 is equal to 3 kilogrammes, so my 2.

2 pounds I also multiply by 3, 6.

6 pounds.

Now that we know what three kilogrammes are, it's easier to find 30 kilogrammes.

One kilogramme, 2.

2 pounds, approximately.

So 10 kilogrammes is 22 pounds.

We multiplied it by 10.

So, in 3 kilogrammes, 6.

6 pounds, approximately.

So 30 kilogrammes is approximately the same as 66 pounds.

Well done, if you said that.

Give you a few seconds to look over that.

Now, estimate the weight in pounds.

So a football, a car, a bag of sugar and a newborn calf.

I want you to think now, roughly how many pounds do you think is a football, is a car, not a toy car, an actual car that we drive.

What about a bag of sugar? And what about a newborn calf? So remember, one kilogramme is approximately equivalent to 2.

2 pounds.

If we're feeling more familiar with kilogrammes because they are metric units, however pounds are Imperial units, so maybe it might be easier for you, if you're more competent in kilogrammes than pounds, to estimate the weight in kilogrammes and then roughly convert it to pounds.

So I'm going to give you a few seconds.

Just jot down, paper and pen, jot down roughly.

I don't want anything exact.

just a rough, sensible guess as to how much these items might weigh in pounds.

And don't forget, once you have finished, I want you to look over and say which, out of a football, a car, a bag of sugar and a newborn calf, would weigh, would be the least in weight, and which one would weigh the most, and see if that's similar to what you've got as a way of checking.

Should I give you be 10 more seconds? Okay, let's have a look.

So, a football might weigh around one pound 'cause, remember, one pound is equivalent roughly to, approximately equivalent to, 2 point, one kilogramme is approximately equivalent to 2.

2 pounds.

So, if we are saying a football weighs a pound, we are saying, it is more or less than one kilogramme? Definitely less, a football, definitely less than a kilogramme.

So we're saying a football might be roughly one pound.

One or two pounds is fine.

What about a car? An actual car, not a toy car.

What did you get? So around 2,800 pounds.

So see a difference between a car and a football? What about a bag of sugar? Is it going to be more or less than a car? Definitely less.

Bag of sugar, about five pounds.

So roughly five pounds.

What about a newborn calf? More or less than a bag of sugar? More or less than a car? More or less than a football? If you want to change your answer, go for it.

Five more seconds before I reveal it.

Okay, 90 pounds roughly.

So a football would weigh one pound, a car would weight 2,800 pounds, a bag of sugar around five pounds and a newborn calf 90 pounds.

Now is Zaki right or wrong? So this is Zaki.

He says, "To convert between kilogrammes and pounds, "I just multiply the number of kilogrammes by 2.

2." I'll give you some time to read that through again what Zaki said.

So, "To convert between kilogrammes and pounds, "I just multiply the number of kilogrammes by 2.

2." So, if we were trying to find, what he's saying is, if we were trying to find, for example, four kilogrammes, you would do 4 X 2.

2.

If you were trying to find 10 kilogrammes, you would do 10 X 2.

2.

Zaki is correct, of course.

So, to convert between kilogrammes and pounds, I just multiply the number of kilogrammes by 2.

2.

For example, if we had six kilogrammes and, if we wanted to know how much six kilogrammes, what the equivalent, approximately, six kilogrammes is in pounds, then we would just do 6 X 2.

2, which is equal to 13.

2 pounds.

What about how many pounds are equivalent to eight kilogrammes? Let's help Zaki out now.

So eight kilogrammes, approximately how many pounds is that? I'll give you some thinking time, and, if you want to jot anything down, go for it.

So, eight kilogrammes is approximately how many pounds? Let's have a look.

So 8 X 2.

2 is equal to 17.

6 pounds.

Well done, if you said that.

Don't forget the pound sign, as well.

I'm not the money pound sign.

Well done.

Now it's time for you to complete your independent tasks.

So I'm going to ask you just to pause the video now and then come back when you have finished, and we can go through the answers together.

Good luck.

Welcome back.

Should we have a look at the answers together now? So, match the objects below with their correct mass.

So you've got a shoe, a pineapple, a TV, a piano and a toddler.

So a pineapple, about one kilogramme.

A TV, 15 pounds, flat screen TV.

A piano, 500 pounds, much heavier.

A toddler, about 14 kilogrammes, and a shoe would be about one pound.

So hopefully, you matched those up correctly and then estimate for a shoe, about a pound.

So, if you want to just check through those and give yourself a tick if you got it correct.

And what I'd like you to do is maybe, just as a practise, is have a look at things that you've got in your kitchen, in your house, in your bedroom, in your garden, and try and guess how many pounds that they might be.

And then you can weigh them either in kilogrammes and just practise doing some conversions.

If you would like to share your work with us here at Oak National, then please do ask your parent or your carer to share your work for you on Twitter, tagging @OakNational and to use the #LearnwithOak.

Now, before I leave you to complete the quiz, I just want to say, well done, on all the converting that you have done with pounds and kilogrammes.

You have worked hard today.

Good luck with the quiz.