(upbeat music) Hey, everybody.

We're here again.

Back with another math lesson.

I've got a quarter and I'm going to flip it.

You call it in the air.

Heads or tails?

Did you say heads?

It was heads.

And I hope you were right.

One of my favorite memories as a kid was whenever we would drive up to my grandparents' house and we'd be in the car all day long.

But once we would finally get there, one of the first things I would do is my grandparents would have this jar that would be full of different coins and change.

And me and my brother would get to go in and we'd dump out all the coins and start counting to see how much money there was.

And we'd split it up so we could each have the same amount.

Now, today we have a problem to solve that has to do with counting money.

So let's get to it.

You know, in our problem, we have Holly, who has a collection of coins, and she has a different collection of 12 pennies, seven nickels and ten dimes.

You know what?

I need a board to help me figure this out.

Board, come in.

How about that?

Now we're ready.

So if we look here, we know that Holly's collection had 12 pennies seven nickels and ten dimes.

So the first question we want to solve is, well, how many coins does she have in all?

And how much money would it be all together?

So let's see if we can solve the problem.

Now, you may solve this a little bit differently than I do, and that's totally fine.

There's different ways to solve problems.

But the way I'm going to start is we're going to start with that first question of how many coins are there in total?

So for this question, the value of them, how much money they're worth, doesn't really matter.

So let's start by trying to add these up to know the total number of coins.

And I'm going to start with the two biggest numbers.

So I have 12 and ten.

And the way I'm going to add those together is I'm going to say, all right, I know I have ten dimes, so there's ten coins and I have 12 pennies.

Now the number 12, what do you know about the number 12?

Well, I know that 12 is just a group of ten and two more.

So I'm actually going to write it like that.

I'm going to say ten and then two more.

Now, as I go to add these together, this makes it a little bit simpler for me because I know ten and ten, I can count by tens to get to 20.

Right?

Ten, ten more is 20.

And now add two more and I'm up to 22 coins.

OK, but we're not done yet, right?

Because there were more coins than that.

She also had seven nickels in her collection.

So we've got to add in these other seven coins.

So 22 plus seven.

I've got to add that together in some way.

Now there's different ways to do this.

I'm going to break this 22 apart again, and I'm going to say I know that 22 is two groups of ten, right?

That's how we added those together.

So I know it's 20, and then I'm going to add two more to that, right?

That would make 22.

Now I can add in my seven, but look here, now I have two and seven and I know how to put those together in a more simple way for me.

So seven and then add two on to that is nine.

So 20 and nine make 29.

So we know that in Holly's collection she has 29 total coins.

Now we've got to figure out the other question.

How much money would this be?

So 29 coins, we're going to get to the amounts here.

So now we've got to figure out, well, ten dimes, remember that dimes are worth $0.10, right?

I know that that's how much those are worth, but I have ten of them.

So as I figure out that amount of money in total, I can count by tens and you may draw this out or you may just be able to count it out.

If we count my tens, we got to count ten times.

So ten, 20, 30, 40, 50, 60, 70, 80, 90.

And 100.

We are up to 100 cents now with our ten dimes.

Now 100 cents is actually the exact same amount as $1.00.

So we know we have $1 just in our dimes.

So now let's go to our nickels.

So if we go to the nickels, we know that nickels are worth $0.05 apiece.

OK, so if they're $0.05, I can count by fives, right?

So we can count on from $1 counting by fives and we can do that seven times.

So $1.05, $1.10, 15, 20, 25, 30, 35.

We're up to $1.35.

So we're almost there.

We just have our pennies left, and we know that pennies are only worth $0.01 apiece.

So to count this on, I can say 135 plus 12.

Or I can just count on by ones to get to my total answer.

So I'm at 36, 37, 38 and keep going all the way until we get to 12 and we're up to $1.47.

That was some great work today.

We solved our problem.

Thanks for helping me out and thanks for helping Holly and we'll see you again real soon.