# Lesson video

In progress...

Hi everyone, I'm Ms. Mitchell.

How are you doing today? Today in math we're going to be estimating and comparing length.

In today's lesson, we will be having an input, you will then be estimating objects, the length of objects.

You will then be comparing objects.

You will then complete a quiz.

For today's lesson you will need, large objects of different sizes, for example, your door, a table, a chair, but please make sure you ask your parent or carer before touching these items. You will also need a pencil and some paper.

Pause the video now to get this if you have not got it already.

This morning we have a star word, and our star word says, estimate.

Can you say the word estimate.

Estimate.

One more time, estimate.

What does the word estimate mean? Have you heard of this word before? So the word estimate means to roughly calculate or judge.

So you're making an educated guess, an educated prediction.

Today in math, we're going to be estimating the length of objects, and we're going to be using a standard unit of measure, which is metres.

Now we know that we use metres when we measure things that are kind of larger, bigger, bigger than 30 centimetres, which is the length of a ruler.

Now, why do we use standard units of measure? Why am I measuring this plant with my hands? Why am I going to use a standard unit of measure? That's right, to make it more accurate.

Because if everyone uses the same unit of measure, we know will be the same.

If I use my hands, everyone's going to have different size hands.

So that won't work.

This is the length of a metre, and I'm going to measure, or I'm going to estimate, the height of my plant.

Now I know the height of my plant is going to be, greater than a metre, but I don't, so this is my metre stick on the floor.

But I don't think my plant is going to be greater than two metres.

So I know it's going to be in-between one metre and two metres.

Now looking at my plant, I think that my plant's going to be closer to one metre, than two metres.

So I'm going to say that my plant is about one metre long.

I'm now going to measure the height of my door.

Now this is a metre, and I know it's definitely going to be greater than one metre.

I think that my door is going to be about two and a bit metres high.

I think it's going to be in-between two metres and three metres.

Now looking at my door, I think my door is going to be closer to two metres, than three metres.

So my door, I estimate is about two metres high.

Now what I'm going to do, I'm going to compare the height of my door to my plant.

And if my door, I'm estimating is two metres, and my plant is one metre, which do I think is greater? That's right.

I think the door is higher, is greater than the plant.

So I will use my greater than symbol.

My plant is less than my door, or my door is greater than my plant.

I would like you to look around your home for some objects that are quite big.

And I would like you to estimate the size of them in metres.

So you're finding some objects, and you're estimating the size in metres.

You're then going to compare the objects in length, and in size, using the greater than or less than symbol.

Now this is just an example of some answers, but yours will be different because remember you measured different items and different objects.

So this is just an idea.

If you can, ask your parent or carer to check your items, just to see if you're on the right track.

Well done for today, you worked really well.