Lesson video

Hi, everyone is Ms. Mitchell here.

It's so great to see you.

Today in maths, we're going to be representing data in a tally chart and a block diagram.

So get yourself ready.

In today's lesson, we'll be looking at tally charts and block diagrams. You will then complete an independent task and a quiz.

For today's lesson you will need a pencil and some paper.

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

Our star word today is "tally".

Can you say the word "tally"? Tally.

One more time really quietly, "tally".

Lovely.

A tally is a great way of keeping a record of objects counted without having to change the number written each time.

You just add one more line every time the number gets bigger.

So, here's an example, one, two, three, four, lazy five.

Six, seven, eight, nine, lazy 10.

I always liked to call it a lazy 10, because it's sort of lying down.

You can see here that each line represents one.

So you can count this as one, two, three, four, five, six, seven, eight, nine, 10.

But the great thing about tally charts is that you can also just count in fives.

Five, 10.

This makes it quicker and easier.

I have gathered some information about people's favourite condiments, but I need your help.

I need you to help me to put it into a tally chart.

Could you please help me? The options were salt, mayonnaise, pepper, mustard, hot pepper sauce or ketchup.

What would be your favourite condiment? Mine would definitely be mayonnaise.

Let's look at the picture here and see how many people chose salt.

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

Eight people chose salt as their favourite condiment.

I'm going to go to Salt on my table.

I'm going to go across to the next column which says Tally.

So here I'm going to do a tally for the number eight.

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

So each line represents one person and this shows that eight people chose salt.

I then have a third column over here, which says the word Total.

So in this column, we're just going to write the number that is represented over here.

So we counted eight people, so we are going to write the number eight.

Let's do the same for mayonnaise.

How many people chose mayonnaise? Let's count together.

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

Another eight people chose mayonnaise.

So, I'm going to go to Mayonnaise on my table.

I go across to where it says Tally.

And remember each line represents one.

Eight people chose mayonnaise, so I'm going to do, one, two, three, four, lazy five, six, seven, eight.

So this shows that eight people chose mayonnaise as their favourite condiment.

So now we go to our last column where it says the word Total, and we write it as a number.

So we need to write the number eight because there was eight in our tally.

Would you be able to pause the video and help me complete the rest of my table? I need you to complete the Tally and the Total column.

Pause the video now.

Great work and thank you for helping me.

Does your table look like this? I can now see that six people chose pepper, 10 people chose mustard, six people chose hot pepper sauce, and four people chose ketchup.

We are now going to transfer this information into a block diagram.

Each block represents two.

Let's do the first one together.

If there are eight people who chose salt and each block represents two, how many blocks will I need to represent eight? Let's count together.

Two, four, six, eight.

I needed four blocks to represent the number eight.

And I can check that because two times four is equal to eight.

Also, if I go across the top of my block is in line with the number eight.

Did you notice that I started my block diagram from the bottom? That's because as you can see on this Y axes that the numbers are going up.

So you always start from the bottom.

Let's do another one together.

I can see here that the next column is where it says Mayonnaise.

So I'm going to go to my table.

I go across to Mayonnaise, and look, it says eight just like salt.

Because salt was four blocks, I know that mayonnaise is also going to be four blocks.

Let's do just one more together.

The next column on my graph is Pepper.

So I go to my table.

Favourite condiment Pepper.

I could see the tally here, five, six, and the total is six.

I start from the bottom.

I make sure I'm in the correct column.

How many blocks do I need to represent the number six? Two, four, six.

I need three blocks to represent the number six.

And I can check this two ways.

The first way is if I go across on the graph, it is perfectly in line with the number six.

Also two times three is equal to six.

Each block represents two.

There are three blocks.

Two times three is equal to six.

Could you please pause the video to complete the rest of the block diagram? And here are the answers.

Straight away I can see the most popular condiment as it has the most amount of blocks is mustard.

As you can see, Mustard goes all the way to 10 people.

And look, if you check Mustard, 10 people.

Also, I can see the least popular condiment, because it has the least number of blocks is ketchup.

It only has two blocks.

And if I go across, only four people chose ketchup as their favourite condiment.

Well done.

Could you now answer these questions by looking at the tally chart? Pause the video now and then press play when you are ready for the answers.

And here are the answers.

Pause the video now to mark your work.

Well done for today.

If you'd like to share your work with Oak National, please ask your parent or carer to share your work on Twitter, tagging @OakNational and #LearnwithOak.

You've done really, really well.

Now finish off your math lesson by completing the quiz.

Take care.

Bye.