Need up to 30 seconds to load.
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
