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welcome to math with mr. J in this video

I'm going to cover unit rates and the

unit rate is a ratio between two

different units and we have to get to a

denominator of one that's going to give

us our per one unit that might not make

complete sense right now but as we go

through the three examples on your

screen you'll start to see what I mean

by the per one unit so let's jump right

in the number one where we have 30 miles

in two hours we need to find how many

miles there are per one hour so we find

a unit rate by writing out our ratio as

a fraction so we have 30 miles per two

hours so I'll put miles hours here so

what we need to do we need to get a

denominator of one that's going to give

us per one hour here so in order to get

a denominator of one how do we get that

two to equal one well let's divide it by

two and with fractions in order to keep

that equivalent so we don't change the

value whatever we do to the bottom we

must do to the top so we need to divide

the 30 by two that will keep everything

equivalent and give us the unit rate

because we'll have a denominator of 1

now 2 divided by 2 is 1 30 divided by 2

is 15 so now we have 15 miles per 1 hour

or 15 miles per hour so 30 miles in 2

hours equals 15 miles per hour or per 1

hour so that's our unit rate number 240

apartments on 5 floors so we want to

find how many apartments per floor

so again let's set it up as a fraction

40 Apartments on five floors so we need

to find out how many apartments per one

floor so again we need a denominator of

one so we do that by dividing both our

numerator and denominator by five again

I chose five so we get this to equal one

so 5 divided by 5 is 1 per one floor

40 divided by 5 is 8 so there are eight

apartments per one floor and we'll read

this from left to right 40 apartments on

five floors equals eight apartments per

one floor or per floor and lastly 16

laps in four days so we need to find out

how many laps per one day set it up as a

fraction

and now we need a denominator of one to

give us our unit rate so we divide by

for both the top and bottom numerator

and denominator by 4 16 divided by 4

will give us 4 laps

4 divided by 4 will give us one day so 4

laps per 1 day or per day 16 laps in 4

days equals 4 laps per day so there you

have it there's how you find a unit rate

hopefully that helped thanks so much for

watching until next time peace