Math 5: Rounding Costs

"Decimals and dragon slayers"... is it a math video or an indie band? There's only one way to find out.

5th GradeMath
Elementary and Middle School5th Grade
LanguageEnglish Language

Transcript

00:33

gas he tries to watch the meter like a hawk but the tank still ends up costing

00:38

19.384 dollars this totally freaks Darnell out he's only got 19 [cost displayed for the tank of gas on the station meter]

00:43

dollars and thirty eight cents where is he going to come up with the extra if

00:46

you can't pay how will he maintaine his dragon slayer honor and whoever heard of

00:50

[Darnell very angry at the cost of the tank of gas] a gas station charging something like nineteen point three eight four dollars

00:54

anyway what are people supposed to do break pennies in half Bob tells Darnell

00:58

that he really needs to relax all Darnell needs to do is a little rounding

01:01

Darnell pats his potbelly and says that he's round enough as it is Bob tells him [Darnell patting his belly]

01:05

that that's not what he means but Darnell should actually think about

01:07

eating less fried cheese when they chow down Darnell says he can't help it

01:11

because his life is depressing for a dragon slayer with no dragons to slay Bob [Darnell looking sad stood by the gas station pump]

01:14

says that they're getting off track issue with this 19.34 number is that

01:19

it goes all the way down to the thousands place but our money only goes

01:22

to the hundreds place this is where the rounding comes in it's no big deal you [pricing sign for regular unleaded fuel and a wallet with 5 dollar bills in]

01:25

identify the place value you want to round to and look at the digit

01:28

immediately to its right if the digit is four or below you should let it go and

01:32

if it's 5 or above you give it a shove Darnell scratches his belly still not getting [Darnell scratching his belly]

01:36

it getting exasperated Bob asks him if four is less than five Darnell is like

01:41

duh so that means is not worth caring about the 19.384 rounds to 19.38

01:47

if it were 19.3 85 or 19.386 though they have to round it up to

01:54

nineteen point three nine but it's not Darnell is beyond relieved the $19 [Darnell cheering in relief at having the correct change]

01:59

38 cents he has is just enough to pay for the gas so they pay up and hit the open

02:03

road later that day they have the luckiest break in their lives when they

02:06

see a dragon and nagging a local supermarket they charge into battle [a dragon breathing fire at a local supermarket]

02:12

and Darnell is so happy he feel like he's on fire that is

02:13

until he realized he actually is on fire poor Darnell [Darnell running away while on fire]