(upbeat music) (smash) (boing) (goofy sounds) - [Kids] Math Mights!

- Welcome back math mights.

I'm so excited that you're here with me today.

I'm Mrs. Markavich, and we are going to do all kinds of fun math things.

Let's check out our plan for the day.

Today we'll be doing a number talk and we'll be sorting flat shapes.

Let's warm up our math brain with a number talk.

A number talk is when I pose a problem with an operation that you're already familiar with and then you're going to try and solve that problem mentally.

That means without using paper pencil, and then you'll share out how you solved, explaining your strategy.

I have a friend from Mathville here today to help me out.

Let's see who it is.

(playful music) - Abracadabra!

- It's our friend Abracus.

Arbacus is sneaky and tricky because he is magical.

He has a wand and he uses his wand to zap numbers to change them temporarily.

And this is to help with compensation.

And then he zaps them to change them back.

Our problem says seven plus eight equals hmm?

I wonder, can you solve that mentally?

Think about a strategy that you might use.

I'm going to have it built on our whiteboard.

Let's take a look at it.

I have seven plus eight equals hmm.

We're going to build seven on top of the double 10 frame mat.

And then on the bottom, we're going to put eight.

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

Were you able to make that picture in your mind to solve this problem?

Let's see what my friend Rocco has to say about how he solved this problem.

He says, "I think the answer is 15.

"I know seven plus seven is 14, "but if I add one more, it is 15."

And guess who's standing right next to Rocco.

My friend Abracus, and he has that magic wand ready to zap some numbers.

Let's take a look on mine.

You can see that I have seven on top and eight on the bottom.

And I heard Rocco say that he knows seven and seven is 14.

So Abracus is going to zap one of those numbers off of the eight, just like that.

And you can see the double, seven and seven equals 14.

And then Abracus zaps it back, and one more makes 15.

Now I'm going to show you what that looks like in my math problem.

I have seven plus, we're going to take that one away because Abracus zapped one away, seven plus seven equals 14.

Then I'm going to bring that 14 down here and Abracus, who's so sneaky, zaps that one back, and now I have the number 15.

Did you solve the problem that way?

Let's take a look at my friend, Aidan.

He solved it a different way.

Did you know that you could do that?

Let's see what Aidan has to say.

He says, "I think the answer is 15.

"I know eight plus eight is 16, "but if I take away one, it is 15."

Let's take a look at that because there's my friend Abracus once again.

So you can see that if Abracus zaps one to the top right here, he now has eight and eight, and we know that that's a double and eight plus eight is 16.

Then Abracus zaps that off of there and takes it away, and he knows that 16 take away one is 15.

Let's take a look at what that looks like in my math equation right here.

I am going to add one because Abracus zapped one on there and turn the seven into an eight plus eight equals 16.

Then I take the 16 down here and Abracus zaps one away.

And now I get the answer of 15.

I wonder, is that how you solved the equation?

Did you make the double eight plus eight equal 16?

And then take one away to give you the answer of 15?

If you did, great work.

Let's check out our "I can" statement of the day.

It says, "I can sort flat shapes "and create a data display to represent our sort."

Let's take a look at these shapes.

Which one doesn't belong?

Let's check out what our friends, Aidan and Rocco, have to say about which shape might not belong.

Rocco says, "A doesn't belong "because it's the only one where you can't see a circle."

And Aidan says, "B doesn't belong "because it's the only one that has a circle and a point."

I have those shapes in front of me right here.

And let's take a look at what Rocco said.

He said shape A doesn't belong because you can't see a circle.

That means when I look at the other shapes, you can see a circle here, here, and here.

So Rocco, you're right, shape A might not belong.

Aidan thinks that B doesn't belong because it's the only one that has a circle and a point.

You can see here's the circle, and here's a point.

But when I look at this shape, I don't see any circles at all.

And this shape, I see circles and no point.

And this one, I only see a circle.

So Aidan could be right too.

That might be a shape that doesn't belong.

Great thinking.

I wonder, are there any other shapes that might not belong?

Rocco and Aidan have some ideas again.

Rocco says, "C doesn't belong "because it is the only one that is shaded."

And Aidan says, "D doesn't belong "because it's the only flat shape."

Let's take a look at mine again and see if we can talk about their different ideas of why they don't belong.

Rocco said C doesn't belong because it's the only one that's shaded, and he's right.

All of these are white and this shape right here is blue.

So it might not belong.

Then Aidan said, shape D doesn't belong because it's the only flat shape, and he is right.

You can see when you look at shape B and C and shape A, they are all three-dimensional, or solid shapes, but shaped D is a flat shape.

So that's another way that they might not belong.

Great job, Aidan and Rocco, determining which shapes might not belong.

Now, it's time for us to have some real fun and sort some shapes into different categories.

The first thing we want to do is give each group a category.

A category is a title for all of the things that will fit in that section.

So if the category is blue, then we would put all things that are blue there.

I made some special categories that have to do with shapes.

Let's take a look at mine.

I have the category triangle, and that means that all of the shapes that go in this category have to have three sides.

Then I have the category square, and all of the shapes that go in this category have to have four sides and they all have to be the exact same length.

Then I have the category rectangle, and in the rectangle category, all of the shapes have to have four sides.

And some of the lengths on the sides might be different.

I brought some pictures with me so that we could do the sorting.

My first shape looks like this.

It has one, two, three sides.

So I know it's a triangle.

My next shape, oh, it looks almost like this one.

It has one, two, three sides so I know that this one is going to go in the triangle category as well.

Let's check out my next one.

Ooh, this one looks a little different than the triangle.

It has one, two, three, four sides and they are all the exact same length.

That means it's a square.

So we're going to put it in the square category.

The next shape I have looks like this.

It has one, two, three, four sides.

So that tells me it could be a square or it could be a rectangle, but I know all of the sides are not the same length so it can't be a square.

It has to be a rectangle.

We're going to put it over here.

The next shape looks similar to the shapes that I have in the triangle category.

And this one has one, two, three sides so I know it's a triangle.

We're going to put it in the triangle category.

The next shape I have, wow, I keep getting shapes that all have three sides.

I think you already know where this one goes.

It goes in the triangle category because it has three sides.

The next shape I have, huh, is another triangle.

It has one, two, three sides.

We're going to put it right there.

The next shape I have, look at that, it's the day of triangles.

It has one, two, three sides so it's going to go right here in our triangle category.

The next shape I have, huh?

Look at that one.

It doesn't have three sides.

It doesn't have four sides.

It looks like a circle.

I don't have a category for a circle.

We're not gonna use it.

I'm just gonna put it right off to the side.

The next shape I have, hm, this one has a lot of sides.

It has one, two, three, four, five, six.

Well, a triangle doesn't have six sides, a square doesn't have six sides and neither does a rectangle.

So I can't use this shape either.

We're going to put it off to the side.

The next shape I have looks like this.

It has one, two, three, four sides but all the sides are not the same length.

So that tells me it is a rectangle.

It can't be a square, and it's definitely not a triangle.

This shape has one, two, three, four sides.

They are all the same length so I know it is a square.

And I have one last shape left.

Can you guess what it is?

Let's flip it over and see.

It has one, two, three, four sides.

All the sides are the exact same length so I know it's a square.

Great work, math mights, sorting all of these shapes into different categories.

You worked really hard.

Now it's time for us to organize and sort some data.

I'm going to take three handfuls of pattern blocks and sort them.

Let me go ahead and grab those handfuls.

And I'm going to sort them into their categories.

This is my favorite thing to do.

I'm going to put all of the trapezoids in the middle.

I'm going to put the triangles over here and the squares in the square category.

Now that I have all of my pattern blocks sorted, we're going to collect some data on that.

And that means we're going to count the pattern blocks and see how many we have of each set.

Let's start with the triangles.

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

And I'm going to write the number nine right there.

Now let's count the trapezoids.

One, two, three, four.

And last, let's count our squares.

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

I wonder what I can do with this information.

One way that I can look at this information is to find out how many more triangles there are than squares.

The first thing we want to do is look at only triangles and squares.

We're going to kind of ignore our trapezoids right now.

What we're going to do is give each triangle a square as a partner, then we'll know how many more triangles there are than squares.

So I'm going to give this triangle a partner, and slide this over and give this triangle a partner.

This triangle has a partner and this triangle has a partner.

This triangle has a partner.

This triangle has a partner and this triangle has a partner.

So now when you're looking at the pattern blocks, how many triangles don't have partners?

One, two.

So I know there are two more triangles than there are squares, and the math problem would look like this.

Nine minus seven equals the two that don't have partners.

Did you come up with the same answer I did?

Great work, math mights.

Now it's your turn to sort flat shapes.

I had a blast with you today.

Until next time, kiss your brains.

(kissing) (upbeat music) - [Student] Sis4teachers.org.

(whoosh) - [Student 2] Changing the way you think about math.

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