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Math 4: Measuring Madness 59 Views
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Description:
When the person's face goes red, then you know they're really mad. But that's just how to measure madness. We've got tons of other measurements in this video. Take a look.
Transcript
- 00:13
Whether we think about it or not, we’re constantly measuring things. [Girl next to a measuring scale drawn on a wall]
- 00:16
There are the obvious ones, like who’s taller –
- 00:19
--or who has bigger feet…
- 00:20
--and the less obvious ones, like who can bawk like a chicken the loudest… [Man in a chicken suit]
- 00:24
Yeah…we think we've got that one on lock. [Woman puts her thumbs up]
Full Transcript
- 00:27
Another unit of measurement? [Teacher at the front of a class]
- 00:29
Time.
- 00:30
When you look at a clock to see how much time is left in math class, you’re measuring time. [Clock ticking]
- 00:34
Time can be measured in seconds, minutes, hours…
- 00:37
… as well as days, months, and years… [Coop pointing at a blackboard]
- 00:39
… which is sometimes how long it seems like math class lasts. [Students crying in class]
- 00:42
We can also measure things like the temperature to know how hot or cold it is outside.
- 00:47
Temperature is measured in degrees Celsius or Fahrenheit – and it’s important to [Thermometer]
- 00:50
know which you’re measuring in.
- 00:52
That’s because 40-degrees Celsius is over 100- degrees Fahrenheit. [Dino pointing at a blackboard]
- 00:56
So if you tell someone to pack for 40 degree whether and forget to mention it's Celsius…well…you
- 01:00
might have one hot-headed friend.
- 01:01
Literally. [Man with a surfboard and man wearing a winter coat]
- 01:03
There are also two kinds of systems for measuring things like distance and weight.
- 01:07
Right now, we're going to cover the metric system.
- 01:09
The metric system of measurement is used… well, almost anywhere you can measure.
- 01:14
The metric system divides things into liters, meters or grams – which are called “base units." [Coop pointing at a blackboard]
- 01:23
And just like a day can be divided into hours, minutes or seconds – each base unit in the [Stopwatch]
- 01:27
metric system can also be divided up. [Arrows pointing to the different units on the stopwatch]
- 01:29
We do this in units of ten, with each unit corresponding to a prefix.
- 01:33
From largest to smallest, those prefixes go “kilo-”, “hecto-”, “deca-”, “deci-”,
- 01:38
“centi-” and “milli-”.
- 01:39
Let’s see how we can convert our metric measurements, to go from, say, a meter to
- 01:43
a millimeter.
- 01:44
First, we need a guide or scale of some kind. [Doctor appears]
- 01:46
For that, let's bring in our special guest star, Jane. [Little girl walking in]
- 01:49
Here’s Jane.
- 01:50
Jane is one meter tall.
- 01:52
But with our metric prefixes, and knowing that
- 01:55
everything gets divided into tens, we could go up the measurement scale and say that Jane
- 01:59
is point-one decameters, point-oh-one hectometers or point-oh-oh-one kilometers tall. [Hand pointing to the different units]
- 02:04
Or, going down the scale, we could say Jane is ten decimeters, one-hundred centimeters,
- 02:09
or one-thousand millimeters tall.
- 02:11
Get it?
- 02:12
And now we have a guide we can use to do any conversion we want! [Doctor pumping their arms in the air]
- 02:15
Thanks, Jane.
- 02:16
We can then put those measurements into fraction form.
- 02:19
And now we have ratios to use for our conversions.
- 02:22
Want to know how many kilometers you’ll have to walk for that 3000 m trip?
- 02:26
Just make 3,000 the numerator of the “kilometer” ratio…
- 02:30
… and we get three thousand over one thousand.
- 02:33
Or, 3 kilometers.
- 02:35
And there you go!
- 02:36
Metric conversion in a nutshell.
- 02:38
We don't recommend you do metric conversion in a nutshell though. [Mans face in a nutshell]
- 02:40
That sounds kinda cramped. [Teacher at the front of the class in a nutshell]
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