Math 4: Converting Measurements

We're going to start off with a murder mystery involving King Henry and chocolate milk, but just stick with us. We definitely absolutely know what we're doing. Usually. 

4th GradeMath
Elementary and Middle School4th Grade
LanguageEnglish Language

Transcript

00:27

He decided to stop and take some icy-cold gulps of his favorite beverage: chocolate milk. [King Henry arrives at the chocolate milk stand]

00:33

Suddenly, a giant acorn fell from the tree King Henry was resting under. [The giant acorn hits King Henry on the head]

00:37

It hit him so hard that he died!

00:39

Whoa.

00:40

Okay….wasn't expecting that….

00:42

Then a giant squirrel took the giant acorn away, removing all evidence of the cause of

00:46

King Henry’s demise. [Giant squirrel walking away with the acorn]

00:48

Thusly, when the King’s knights found him, there was no clear explanation for what had [Knight arriving]

00:52

happened.

00:53

The mysterious death baffled all the kingdom.

00:56

The next day, the paper’s headline read:

00:57

“King Henry Died Unexpectedly Drinking Chocolate Milk.” [Newspaper]

01:01

And thus, we were given the key for converting any metric measurement!

01:04

….Wait. What?

01:05

What just happened…?

01:06

Uh…

01:07

Let's back up and try to explain that crazy story. [Man cheers and video game style acheivment appears]

01:09

Remember, the metric system is a scale of measurement that is based on a scale of tens.

01:14

With that scale, we can easily convert between any measurements. [Dino pointing at a blackboard]

01:17

And as it turns out, that headline about ol’ King Henry’s untimely demise can help us, too.

01:22

Check it out.

01:23

Look closely, because the first letter of each word in that sentence represents a prefix [Each first letter of the words in the newspaper headline is highlighted]

01:28

of the metric system.

01:29

When we want to convert measurements with that sentence, all we do is count how far

01:33

away the two units are from each other in that sentence, and move the decimal point [Fingers counting along]

01:37

that many spaces.

01:38

Let’s say the late King’s Official Master of Chocolate Milk was taking inventory for [The 'Master of Chocolate Milk' holding a scroll]

01:43

the sake of the King’s will, and had a three-liter barrel of chocolate milk, which he wanted

01:47

to record as milliliters.

01:49

Let’s look at our sentence, again…

01:51

We start at the “U”, because “liter” is one of our base units…as would be meter,

01:57

or grams…

01:58

We move to the “M” in “Milk” for milliliters and find that we’ve moved over three spaces [An arrow shows the 3 spaces in the acronym]

02:03

– or three decimal points, giving us 3,000!

02:06

So, the King’s Master of Chocolate Milk has discovered that the King’s family will

02:10

be inheriting 3,000 milliliters of chocolate milk!

02:13

“King Henry Died Unexpectedly While Drinking Chocolate Milk” turns out to be a pretty [King Richard and Henry's gravestones]

02:17

math-free way of doing some math.

02:19

Of course, it’s more emotionally trying if you happened to have been close to King [Knight arrives at the grave]

02:23

Henry… so sad… so unexpected...