[bright music] - [Lily] Omar, isn't it so nice walking together?

- [Omar] Yeah, there's so much to see.

- [Lily] Like all this snow and water.

I wonder how the lake got here.

- [Omar] I think the glaciers formed this lake, and, now, because it's winter here, it's frozen over.

It's a sheet of ice.

- [Lily] Wow.

I know people who go fishing through the ice.

Oh, look, some leaves.

I think there are three.

- [Omar] Three.

Let me check.

One, two, three.

You're right.

There are three leaves in the ice.

And, look at this, another three.

That tree has three big branches.

- [Lily] Oh, and three bike racks.

- [Omar] And, three benches.

Whoa, our world is filled with threes today.

- [Lily] Sure is.

Well, I think we're getting to the end of our walk.

Let's head home, Omar.

- [Omar] Look at the sign.

Friends at home, do you see three in this picture?

- [Lily] I do.

I do.

I do.

It's a triangle, so I know it has to have three sides.

Omar, we're getting so quick at seeing all these threes around us.

- [Omar] Isn't it cool that sometimes we just see three, we don't always have to count it?

- Being around all that water, Omar, makes me wanna play with our collection of shells.

- That's a great idea.

You know, Lily, playing with shells, it's got me thinking.

Remember how earlier, when we were going for a walk, we were seeing the number three everywhere?

- Oh, yeah.

We were.

- That thing where you see a number of items and know immediately how many there are, that's called subitizing.

With these shells, we can play a subitizing game that'll get our brain thinking, and fast.

It's called speedy numbers.

- Sounds fun.

I'm ready to play.

- Let's do it.

But, before we start, we need a material like this sheet of paper that we can use to cover the shells.

It's the covering and revealing that makes it speedy numbers.

Once we start playing, I'm gonna show you a certain number of shells for just for a few seconds, and then I'll cover it up.

Lily, friends at home, try to remember how many shells you saw.

Take a mental snapshot of the image, then share your speedy number.

- Let's do it.

- [Omar] Okay, here we go.

Friends at home, how many did you see altogether?

- [Lily] Two.

I know that's two.

- [Omar] Great, you're right.

Let's keep going.

Friends at home, what do you think?

- [Lily] Four.

- [Omar] Yeah, it was four.

- [Lily] Three.

- [Omar] You got it.

- [Lily] Four.

- [Omar] You're on a roll.

- [Lily] One.

I know that's one.

One shell all alone.

- [Omar] That's right.

Let's keep going.

- [Lily] Four.

- [Omar] Friends at home, what do you think?

Yeah, it's four.

Four shells.

- [Lily] Six?

- [Omar] Let's look at that one again, Lily and friends at home.

Let's try counting it.

- [Lily] Okay.

One, two, three, four, five.

Oh, it was five.

- [Omar] That's right.

Five.

I saw three on the top and two on bottom.

And, three and two makes five.

- [Lily] It sure does.

Okay, I think I got it.

Let's do a few more.

- [Omar] Okay, here we go.

- [Lily] Four.

- [Omar] Yep.

- [Lily] Another four.

- [Omar] That's right.

- [Lily] And, six.

- Good job, Lily.

Good job, friends at home.

Lily, that was so fun.

- It was fun.

And, you know what?

When we played, I noticed that sometimes we saw the same number, but in different ways.

Isn't it cool when things don't always look the same?

- Yeah, it is cool.

Friends at home, did you notice that?

How the same number can look different ways?

For example, we saw that the number four can look like this.

- [Lily] And, this.

- [Omar] And, this.

- [Lily] And, this.

- [Omar] And, this.

- [Lily] They look different, but they're all four.

- Exactly.

Lily, friends at home, you're getting pretty good at subitizing.

I think you're ready for a challenge.

This time, I'm going to show you two sets of shells.

You're gonna have to add them together, and quickly, to figure out how many shells there are.

- Let's play.

- Let's do it.

Okay, here we go.

- [Lily] Three.

- [Omar] How did you know?

- [Lily] I saw two shells and one shell.

And, two and one makes three.

- [Omar] That's right.

Okay, here's another one.

Friends at home, how many did you see altogether?

Yeah.

Two and two, that's four.

Okay, friends at home, what about this one?

- [Lily] Four.

Another four.

This time, I saw three and one.

- [Omar] That's right.

Okay, here's another.

Friends at home, how many did you see altogether?

- [Lily] Three, because I saw one and two.

- [Omar] And, one and two makes three.

Nice.

- [Lily] Oh, this is a hard one.

Let me think.

Six, because three and three is six.

- [Omar] Great subitizing, Lily.

Friends at home, how many did you see altogether?

Did you see five?

Yeah, five is right.

Okay, I have one final one.

And, this is a tricky one.

- [Lily] I saw four and four.

What is that?

Oh, yeah, four and four is eight, eight.

It was eight.

- Great adding, Lily.

That's right.

We saw so many numbers today and we saw them fast.

- Yeah.

And, all this water and shells, it's really inspired me.

It makes me want to move like water.

- Let's dance.

[orchestrated music] [orchestrated music]