(bright lively music) (footsteps plodding) - (puffs) Hello, everyone.

And good morning.

It's so good to be with you today.

I have been out jogging with Frisbee and it is hot.

Well, while I was out, I grabbed the mail and there was a postcard.

So, let's see what it says.

Ms. Post.

We started working on rounding this year in school.

I kinda understand it, but I don't know why we would ever need to round.

Could you give me some real life examples?

Thank you for this postcard.

And that's a great question.

Now, remember, rounding is a way to simplify and shorten numbers.

And here's an example.

When runners run a race, their running times often get shortened because no one really wants to know their time with a really long decimal number.

You know, I'm not the only teacher around here that's been running lately.

Yesterday, the teachers were racing each other.

Who do you think won?

Well, we're about to find out.

This afternoon, we're going to have a celebration.

And the fastest runner gets to decide what we eat for dinner.

I'm going to share the teacher's running times with you, and we'll see if we should round the numbers before we show them to the teachers.

But first, let's review how to round numbers.

I have a chart up here for us to look at, and it has the important steps to remember.

So first, find your place in the number.

Where is it that you want to round to?

Number two, look at the number next door.

Three, if that number is five or more, then you're gonna let your number soar up.

If it's four or less, you wanna let your number rest.

And don't forget, all the numbers in front will stay the same.

All the numbers behind, zero's their name.

Okay.

So, let's think about an example.

What if we wanted to round or shorten 4.57 to only have tenths?

Step one is that we find our place.

And we said tenths, so that would be the five.

Step two, look next door.

Next to the five is a seven.

Since seven is five or more, we are gonna let that five soar.

So, it will round up to a six.

So, 4.6.

And then remember, we say all the numbers behind stay a zero.

So, the seven drops away and it's a zero.

Now, let's apply the rounding rules to the teachers' running times.

So, here are the teachers' times for the hundred yard dash in seconds.

Susanna ran a 16.594.

Joel ran a 20.812.

Stacey ran a 17.239.

Randi ran a 17.643.

Courtney ran a 15.917.

And Meghan ran a 16.386.

Now with rounding, the goal is to simplify everything as much as possible without losing the value of the numbers that are involved.

So, for this race, let's see if we can drop the decimals completely and round these numbers to be whole numbers.

So first, let's find our place.

We're going to start in the ones place and look next door at the tenths place.

If that number is five or more then we'll let our numbers soar.

If it's four or less, we'll let our number rest.

So, Susanna would round up to a 17.

Joel and Frisbee would round up to 21.

Stacey would round down to 17.

Randi would round up to 18.

Courtney would round up to 16.

And Meghan would round down to 16.

Uh-oh, some numbers are the same now.

If we round to the ones position and drop the decimals completely, I can't pick a winner because some of the times are the same when the numbers are rounded like this.

I want to be able to tell the teachers their times and announce the winner, too.

But I don't wanna say three decimal places.

That's too much.

So, let's see what happens if we round to one decimal place.

First, let's find our place.

We're going to start in the tenths place and look next door to the hundredths place.

Five or more, let it soar.

Four or less, let it rest.

To the tenths.

Susanna would be 16.6.

Joel and Frisbee would run a 20.8.

Stacey, 17.2.

Randi, 17.6.

Courtney, 15.9.

And Meghan, 16.4.

All right, when we round to tenths, we can see that Courtney is definitely the winner.

Way to go, Courtney.

And I liked that the numbers aren't going to be quite so long when I read them off to everyone.

I hope today's lesson helped you think about when rounding numbers can be important.

Have a great rest of the day.

Remember, keep a positive mindset, grow everyday by reading and asking questions.

There's nothing you can't do if you put your mind to it.

I'll see you soon.

Bye.

(bright lively music) ♪ It's time to rise and shine ♪