(classical music) (whip cracks) (classical music) (jingles) (honks) (acoustic sounds) (classical music) - [Pupils] "Math Mights" - Hi kindergarten Math Mights, my name's Mrs. Gray and I can't wait to do math with you today.

Today, we're going to be doing a Mystery Math Mistake and we're going to be counting groups up to 20.

Get ready for our Mystery Math Mistake.

Take a look at all of our maths field character.

Oh my goodness, they're all mixed up.

All of their math strategies have become confused that what we're gonna be helping with in our mystery math mistake.

The way it works is I'm going to be doing a problem with DC's help today.

And you are going to be watching to see if you can see if there is a math mistake along the way.

Here's our problem.

DC helped me today to write different number sentences to match some 10 frames, here is what DC did.

He looked at the first 10 frame and he wrote the number sentence seven plus three equals 10.

Then he looked at the next 10 frame and he wrote eight plus two equals 10.

Then looked at the last 10 frame and he wrote four plus five equals 10.

What do you think?

Did he get them all right?

Or did he make a math mistake?

Hm!

Let's go to our friends to see what they think.

Our friend Eric said that the numbers sentences seven plus three and eight plus two were correct.

Our friend Maki thinks that maybe the last number sentence that we did was incorrect that there were four red and six yellow counters.

That means it has to be four plus six.

Let's take a closer look at his idea.

So seven and three equals 10 because seven red and three yellow, that one looked good.

The next one was eight plus two, eight were red and two were yellow.

And that equal 10, that one looked good, great job DC.

The last one, we had four for red and we had five.

Wait a minute.

I think our friend Maki was right.

There's not five yellow, there's six yellow.

So it would be four plus six.

Let's help DC change the last number sentence.

So we're gonna look at this.

We're going to cross it out 'cause we know that was our mistake.

It should be four for the four red plus six for the six yellow.

And that equals 10, great job math mites.

You were able to help DC find the mystery math mistake.

Let's take a look at our, I can statement for today.

I can answer questions about how many are in groups up to 20.

Today, I have a pile of linking cubes to show you, what do you notice?

What do you wonder?

Boy, I noticed that there is a lot of linking cubes there and there's lots of colors.

Let's take a look at our friend Eric and Maki and see what they have to say.

Eric noticed that the cubes are all in a pile and it is very messy.

Our friend Maki noticed that none of the cubes are connected and that there are many colors in the pile.

What is it that make them wonder?

Our friend Eric wondered how many cubes are there?

And our friend Maki wondered are there more red cubes or are there more yellow cubes?

Hm!

I wonder what you noticed.

What did you wonder?

Let's take a closer look at our pile and see what we can do with it.

So here's my pile of linking cubes.

We learned lots of different ways to count.

Maybe we could line them up or use our counting map but today we're gonna be using our double 10 frame to help us.

When they're in a pile here, this is really hard for me to count.

If I was to go, I would count and I could mess up really easily.

So let's take them and organize them on our 10 frame.

We're gonna fill up the top 10 frame first and then if there's any more we'll fill up the bottom 10 frame, there we go.

I noticed right away that there was 10 at the top.

I know there's 10 because it's a 10 frame.

Remember, whenever we see a 10 frame there's always going to be 10 boxes.

We can't take any away or add any more to the 10 frame.

So we know that it has to be 10.

So at the top I noticed the 10 we can represent that by using our friend value pack.

Here's the 10 and then we have five more.

Here is our five more.

Remember, our friend value pack is a family and they wear their values on their belly and they can unhook and click back together to show different values.

So we can take the 10 and the five and click it together to show the number 15, 10 and five is 15.

Great job math mites, thanks for all your help organizing into the double 10 frame to make it easier to count that collection.

Now we're gonna do it again.

Clare, Andre and Noah counted a set of linking cubes.

Clare sad that there were 15 cubes, Noah said that there were 17 cubes and Andre said that there were 16 cubes.

What do you think?

Could they all be right?

They all counted the same group of cubes.

I think that two of our friends might've made a mistake when they were counting.

Let's hear what our friend Maki and Eric had to say.

Our friend Eric said that, no, they can not all be right.

If they counted the same group of objects then they should get the same number.

Our friend Maki said that they were not careful when they counted.

They must have mixed them up or maybe they just forgot they're counting as they were moving them on their mat.

I think we should take a closer look.

So what we're gonna do with our My Counting Mat we're gonna take all of our cubes and put them on one side and as we count, we'll be moving them over.

That way, we're sure that we only count the linking cubes one time.

So let's take all of our cubes and we're gonna put them on one side of the mat.

And as I count, I'm gonna move them over.

Can you help me count, one, two, three, four, five, six seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17.

I got 17 linking cubes, did you?

Let's look a little closer at the 17 cubes.

So I organize them into a group of 10 up here and then five and two more, that's seven down here.

I can use value pack to help show the 10 and the seven.

Remember, we can click them together to show that 10 and seven more is 17.

Great job helping me count.

Our friend Noah was right.

Noah thought that there was 17 linking cubes.

He must've been very careful when he counted and only counted each linking cube one time.

You are working so hard today.

The next thing we're going to do is practice counting, rearranging and counting again.

Take a look at these five different arrangements that I have for you today, which arrangement is easiest to count?

Why?

What makes it the easiest to count?

Let's take a closer look at our mat to count the different arrangements.

The first arrangement we have here I see that there is 10, like in a 10 frame and two more, that means that there is 12.

Looking at the next arrangement, I noticed that there are six on this side and six on this side.

We could also count by twos; two, four, six, eight, 10, 12.

There are also 12 on this arrangement.

Look at the next arrangement.

Here is a big line of 10 and there are two more, 10 and two is 12.

Look at the next arrangement.

This one is arranged like you might see on a dice.

There are three and we could practice counting by threes; three, six, nine, 12.

In this arrangement, there is also 12.

Look at the last arrangement.

This is arranged in a big circle.

This is kind of a tricky one because if I started, I would have to make sure I counted but I stopped before counting it a second time.

A good strategy that we could do is to use a marker or a crayon to put a little dot on each one as we count.

That way, we make sure we stop at the right place and only count them once.

So we're gonna start here.

We're just gonna go one, two, three, four five, six, seven, eight, nine, 10, 11, 12 and I'm gonna stop because we already counted that dot there was also 12.

Even though these arrangements had the dots in different ways, they all showed the number 12.

Which arrangement did you like the best?

Which one was the easiest for you to see the number 12?

Wow Math mites, you're working so hard.

Now we're gonna be trying to apply what we just learned by counting different collections.

Then we're gonna rearrange 'em and try counting them a different way to see if we still get the same answer.

The collection I'm going to use first is some buttons.

Here's my buttons in a big pile.

This is too hard to count.

I'm gonna take 'em and arrange 'em.

I'm going to pretend that they're on a 10 frame so I'm going to do five and I'm gonna build five underneath.

There's my group of 10, like a 10 frame.

Then I'm gonna take the rest and just line them up so I can see that there is 10 and four more.

That means there is 14.

Now we're gonna mix them up and then we're gonna try to rearrange them again and recount.

I think this time I'm gonna move 10 over here and I'm just gonna move the rest over here.

I know this is 10 and there are four more 10 and four more is 14.

Let's bring in our place value strips to show the number 14.

So we had 10 and four more and we can click them together like the value pack to show the number 14, 10 and four more is 14.

Both times I counted my collection I got 14, even though they were arranged in different ways.

Wow Math mites, you worked so hard today.

You are going to get to play a new game called Build a Tower.

This game is gonna help you apply the different skills that we learned today counting to 20.

I hope that you had a great time with me today and I can't wait for you to come back soon.

(classical music) - [Pupil] Sis4teachers.org, changing the way you think about math.

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