(bright upbeat music) (Springling springing) (bright upbeat music) - [Kids] Math Mights.

- Hi kindergarten Math Mights, my name's Mrs. Gray, and I can't wait to do math with you today.

Today, we are going to be doing a Mystery Math Mistake and we're gonna be doing something with hidden cubes, are you ready?

Look at the Math Mights, oh, no, all the Math Mights are mixed up, all of their math strategies have gotten confused.

Well, that's a clue for our Mystery Math Mistake.

Here's how the Mystery Math Mistake works, I am gonna be solving a problem and while I solve it, I want you to get out your magnifying glass and try to see if I make a mistake.

The problem today says there were seven marbles on the table.

Three rolled away.

How many marbles are left on the table?

Are you ready?

Do you have your magnifying glass?

It said there were seven marbles, one, two, three, four, five, six, seven, then three marbles rolled away, so I'm gonna put three more counters, one, two, three, that means there were 10 marbles.

I'm gonna do my quick draw to match the problem.

There were seven marbles and three rolled away, so I'm gonna put three more, seven plus three equals 10, do you agree with me?

Did I make a mistake?

Let's go to our friends today.

Our friends, Simon and Orlando have some ideas about the problem I did.

Simon said that he didn't see the drawing with anything crossed off, and Orlando said that if there were seven marbles and three rolled away, then there should be less, which means it should be seven minus three equals four.

Hmm, that gives me a lot to think about, and I think they might be right because it said that three marbles rolled away, so that means I need to take them away, and that's a subtraction problem, what I did was an adding problem, I put three more marbles but that doesn't make sense because they rolled away.

So there were seven marbles, one, two, three four, five, six, seven, three marbles rolled away, so we need to take them away.

One, two, three, that means there are four marbles left.

Let's do our quick draw to match the problem.

There were seven marbles, three of them rolled away, I can show that by crossing them off, and there were four left, let's write the number sentence to go.

Seven take away three equals four, great job kindergarten Math Mights, let's look at our "I can" statement for today.

I can figure out how many cubes are hidden.

Today, we are gonna go on a trip, we are going camping, have you ever been camping?

I love going camping in the summer and here in our camp site today, there is a tent and there are some chairs by a warm fire.

You are gonna help me figure out how many friends are in the tent.

There are 10 friends coming camping, some are in the tent and five are by the fire, now we need to figure out how many are in the tent.

We're gonna be using linking cubes today, and we're gonna pretend that these are the people in our story.

This is our tent, and here is our campfire at our campsite.

There were 10 friends and five of them were by the fire roasting marshmallows.

One, two, three, four, five.

Now that we know five are by the fire, we have to figure out how many are hiding in the tent.

Hmm, I wonder how many are in the tent?

Do you know what, we're gonna try a comparing bar.

This is our comparing tower, it has 10 cubes on it.

The 10 cubes will show us how many people are at the camp site.

Now I'm gonna take the five friends that are by the fire and I'm gonna turn them into a tower.

So we're gonna put them together and then we'll be able to compare it with the size of the tower of 10.

So when I put it together, I wonder how we could use it to figure out how many are in the tent, do you have an idea?

Let's look.

So we know that there are five that were by the fire, and we know this is the 10 that were at the camp site.

That means however many are missing here is how many should be in the tent.

Let's count to see how many we think might be in the tent.

So there is one, two, three, four, five, there is five cubes that are missing, do you think there might be five in the tent?

Let's check and see if we're right.

Ah, I think there's five, let's put it together and check.

One, two, three, four, five, there were, there were five friends in the tent, we can write that as a number sentence.

10 equals five that were by the fire plus five that were hiding in our tent.

Great job, Math Mights, you were able to help me figure out how many kids were in the tent.

I have a question for you now.

How did making another tower of 10 help us figure out how many people were in the tent?

Hmm, so when I used the comparing tower, how did that make it easier for you to find out the number of people in the tent?

Our friend, Simon has an idea.

Simon said that he was able to line them up to see how many were missing, so Simon did what we did.

He took the comparing bar and he lined up what he had and he was able to figure out how many was missing, that way he knew how many were hiding in the tent.

I think that we are having so much fun, we should try one more problem.

But this time we are gonna be using another way to show it instead of a comparing tower.

So here I have three friends by the campfire and I hid some friends in the tent, how many friends do you think are in the tent?

Hmm, I think we are going to be using a 10 frame this time.

So I'm gonna take the three friends here and I'm just gonna organize them on our 10 frame, these are the friends that were by the campfire.

If there was 10 friends at the campsite that means however many boxes are empty, I think that's how many are hiding in the tent.

Are you ready?

Let's go back to our 10 frame.

So if you see, there are two empty boxes here and five here, that means there are seven missing, so do you think there might be seven hiding in the tent?

Are you ready to check and see?

Here we go.

Hmm, that's a lot, let's organize them on the 10 frame to check to see if we were right that it was seven.

There was, there was seven friends hiding in the tent.

We could also write that as a number sentence.

We could write, three, for the three friends that were by the fire plus seven that were hiding in the tent, and that was 10 for all of the friends that were at the campsite.

Great job Math Mights, thanks for helping me.

Now, I have a question for you, how did putting the linking cubes on the 10 frame help us figure out how many people were in the tent?

Hmm, what do you think?

Our friend Orlando said that he looked to see how many were empty on the 10 frame to figure out how many were missing, and the missing number had to be the number that was hiding in the tent, did you do what Orlando did?

I think that's a great strategy Orlando.

Are you ready to try something new?

Han had a tower of 10 cubes.

He snapped it into two parts and hid one part behind his back.

He showed his partner four cubes.

How many cubes is he hiding?

So we're gonna act out Han's problem.

So he had a stick of 10 cubes and he broke it into two pieces.

He hid some cubes behind his back and he showed his partner four.

Now, I think we're gonna go back to the comparing tower to help Han figure this out.

So here's our four, and I'm gonna go down here and I already have a stick of 10 ready.

So if there was four, I could line it up and remember, we could look for how many are missing, do you think you could help me count?

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

So Han showed his friend four cubes that means he must have six behind his back, are you ready to check?

Here's the tower that was hiding behind his back, let's see if it matches.

When we put it back together, it was six.

We can write that out as a number sentence, four plus six equals 10.

Wow, Math Mights, you're working so hard today.

Now I have a question for you, how is making 10 with connecting cubes the same as using a 10 frame?

Hmm, our friend Simon has an idea.

Simon said that he gets the same combination of numbers to make 10.

Four connecting cubes and six connecting cubes makes 10, just like on the counters.

Simon said that the four connecting cubes and six connecting cubes, when you put them together, still made 10.

Hey, we can write that as a number sentence, four plus six equals 10.

Now, if we look up here at the 10 frame, we can see that there are four red counters and six yellow counters that can also be written as a number sentence, four, for the red counters plus six for the yellow counters equals 10.

Both the counters and the cubes even though they're different tools, help us figure out the same math equation.

Great thinking Simon, we can use so many different math tools to help us solve different problems.

Now it's your turn, you are going to get to play 'Kids in the Tent.'

You are gonna be able to do what we did where you have some kids by a fire and some kids in the tent, and you have to figure out how many there are.

We did so much today, today we did the Mystery Math Mistake and we were able to figure out different ways to make 10 by looking at the kids on their camping trip.

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

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- [Girl] Changing the way you think about math.

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