(dramatic music) - [Children] Math Mights.

- Welcome back first grade Math Mights.

I'm Mrs. Markavich and we're going to have so much fun with math today.

Let's check out our plan for the day.

Today we'll be doing a numeracy talk with our friend Dotson.

Then we'll be adding 10 more and 10 less.

Let's warm-up your math brain with a numeracy talk with our friend Dotson.

Dotson is a subitizing superhero.

Subitizing is when you can tell me a number without counting it.

Let's get your camera ready.

Remember, you're going to take a picture and hold it there, when you see our famous double 10 frame.

Today don't tell me what you see.

Keep it a secret because I have a secret question for you.

Are you ready?

Here comes that famous double 10 frame.

Hmm.

I wonder what you saw.

Here's my secret question.

I wanna know what two more than what you saw is.

Let's take a look at one of my friends, Amaya, Amaya thinks that she saw 15.

So two more would be 13.

Thanks for sharing Amaya.

Let's check out what my friend JJ thinks of Amaya's answer.

JJ is such a great friend that he says, "Amaya, I politely disagree with you.

"I saw 15.

"So two more "would be 17."

Hmm.

Great thinking, JJ and Amaya.

Let's talk about this a little more with my famous double 10 frame.

You can see that I have 10 on top.

Remember you don't have to count them, and five on the bottom.

So 10 add five is 15.

JJ says that two more would be 17.

10, 15.

Two more 16, 17.

Wow, great thinking JJ!

Kiss your brain.

Now let's talk about my friend Amaya.

Amaya said, "I saw "15."

10 on top and five on the bottom which is 15 and two more would be 13.

Hmm.

Two more.

This is what 13 looks like.

I think she accidentally took two away.

Remember that key word more tells us that we want to add two to get 17, not take away, but that's okay Amaya.

Sometimes in math, we make mistakes, but guess what?

Try it again next time.

Now I wanna jump on over to our I can statement of the day.

Today I'm trying to find 10 more or 10 less in my head.

I think you can do that.

Let's take a look at another activity.

In this activity we're going to be thinking about two equations.

Think about these subtraction problems.

How did you solve them?

Let's take a look at my first friend.

Harper says, "I thought of it "like our numeracy talk with Dotson on the 10 frames."

I can see that Harper saw that 10.

She saw three more.

And in her mind she crossed off that 10 and only saw three more on the bottom which means 13 minus 10 equals three.

Great thinking Harper.

My next friend, Deion thinks 15 minus 10 equals five.

He says, "I like Harper's idea, "another way to solve this is with Value Pak."

Remember Value Pak?

There are two parts.

There is a red part which represents the tens and a white part, which represents the ones.

When we take a look at this, we see 15 minus 10.

Our friend Deion took that 10 away and was left with five ones.

All right, Math Mights.

Now it's time for us to do another activity.

We're going to find the value that makes each of these equations true.

We have 67 plus 10 equals?

Hmm.

And we have 67 minus 10 equals?

Hmm.

Let's take a look at my whiteboard.

I have it broken down in two ways.

On the left side we have 67 plus 10 equals?

Hmm.

That's our question.

On the other side, we have 67 minus 10 equals?

Hmm.

Let's start over here with 67 plus 10.

Remember we are going to count our tens first.

And then our ones.

We have 10, 20, 30, 40, 50, 60, 61, 62, 63, 64, 65, 66, 67.

60 and seven ones is 67.

We have 67 plus 10.

I'm going to join that 10 with my other tens and then I'm going to count by tens.

10, 20, 30, 40, 50, 60, 70 71, 72, 73, 74, 75, 76, 77.

You're going to take that 10 and slide it over there together and we are going to get 77, just like that.

Now we're going to take a look at it another way.

This time we're going to do 67 minus 10.

Let's start by counting, starting with the tens.

10, 20, 30, 40, 50, 60.

Keep counting.

61, 62, 63, 64, 65, 66, 67.

And here's my number 67.

This time I am taking away 10.

That means I am going to take one of my tens away from the problem.

Now let's count to see what we have left.

10, 20, 30, 40, 50, keep counting.

51, 52, 53, 54, 55, 56, 57.

And that number looks like this 57.

So you know that 67 minus 10 equals 57.

That was some great work Math Mights.

Now we're going to hop on over and look at another activity.

I want to find the value that makes the equations true.

52 plus 10 equals?

Hmm.

And 52 minus 10 equals?

Hmm.

Count with me.

10, 20, 30, 40, 50, 51, 52.

That number looks like this.

I have five tens and two ones, which makes 52.

Now we need to add 10 more.

And I'm really good at knowing what a 10 looks like.

So we're going to add 10.

My number 10 looks like this.

Now I want to do 52 plus 10 and let's count them up and see what we get.

Count with me.

10, 20, 30, 40, 50, 60, 61, 62.

62 looks like this.

Six tens and two ones makes 62.

Kiss your brains.

Now we're going to do the next equation.

52 minus 10.

When we do 52 minus 10 I want you to remember that we are taking away.

We are not adding.

So we're going to look at our giant abacus one more time.

We already know how to build 52.

So count along by tens with me.

10, 20, 30, 40, 50, keep counting.

51, 52.

And remember 52 looks like this.

Five tens and two ones makes 52.

This time we're taking 10 away.

Count with me.

We're going to count by ones this time.

We're taking away 10.

One, two, three, four, five, six, seven, eight, nine, 10.

Hmm.

I wonder what's left!

Count with me and let's see what the answer to our equation is.

10, 20, 30, 40, 41, 42.

The number 42 looks like this, 42.

I have four tens and two ones, which gives us 42.

You're getting so great at adding and subtracting tens.

We're going to try it with my friend Value Pak.

Let's take a look and see if we can do this mentally.

I have 39 plus 10 equals?

Hmm.

And I have 39 minus 10 equals?

Hmm.

Let's a look.

Here is 39.

I want to add 10.

39 add 10 gives us 49.

I used Value Pak to help me get from 39 to 49 by adding 10.

I wanna take a look at another equation.

39 minus 10.

My number 39 looks like this.

This time I am not going to add 10, I'm going to take 10 away.

39 minus 10.

Do that in your head.

39 minus 10 gives me 29.

Thanks for helping me out Value Pak.

I was able to do 39 minus 10 in my head with your help.

Math Mights I'm so impressed with your math skills right now that we're going to try a problem that my friend Amaya is so excited about.

Amaya thinks this problem is easy because the answer will still be 45.

Do you agree or disagree?

Let's take a look.

Her problem says 45 plus 10 minus 10 equals?

Hmm.

Let's solve that together.

In front of me on my place value board, I have tens and ones.

Let's count them together.

We're going to start with the tens.

10, 20, 30, 40.

Keep counting.

41, 42, 43, 44, 45.

I have 45.

Amaya says, "Add 10."

I'm going to put the tens right here.

Let's count it again.

10, 20, 30, 40, 50, 51, 52, 53, 54, 55.

Now Amaya says, "Take 10 away."

Let's count it again.

10, 20, 30, 40, 41, 42, 43, 44, 45.

Hmm.

I'm right back where I started, Amaya was right.

The answer was still the same, 45 plus 10 minus 10 equals 45.

Great job, Amaya.

I like your thinking.

And I like your thinking too, friends.

Now it's time for you to try it on your own.

There's a game that I want you to try where you are adding 10 and taking 10 away.

Good luck.

I know you'll do great.

Make sure you kiss your brain.

And I cannot wait to see you the next time here on Math Mights.

Have a great day friends.

(dramatic music) (uplifting music) (gentle music) - [Narrator] Sis4teachers.org (air whooshing) changing the way you think about math.

- [Announcer] This program is made possible with funding from the Michigan Department of Education, Governor's Education Emergency Funds.

The State of Michigan and by viewers like you.

(uplifting music)