ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Math 5: Multiplying Fractions 393 Views
Share It!
Description:
Multiplying fractions is as easy as pie... and significantly easier than pi.
Transcript
- 00:04
[Dino and Coop Singing]
- 00:13
So the big day has finally arrived. Huh? Why are you wearing a wedding dress
- 00:17
oh yeah we see how that was misleading.. Not that big day but still it's a pretty [Woman in a wedding dress]
- 00:22
big day, today we learn how to multiply fractions yes you can still wear the
- 00:26
wedding dress. The basic idea is pretty simple we take two fractions each with
Full Transcript
- 00:30
their own numerators and denominators then we multiply the two numerators
- 00:34
together giving us the product's numerator and we multiply the two denominators [Dino and Coop looking at a blackboard]
- 00:39
together giving us the product's denominator if there are any common
- 00:43
factors we simplify them out and that's it. No seriously, that's it. We
- 00:48
know it's almost too easy like going fishing and having the fish just jump
- 00:52
into your boat, but hey sometimes you get lucky. Still not convinced that easy? Well,
- 00:57
A - how dare you call us liars and B - let's check out an example. Let's say we [Guy in Shmoop shirt looking offended]
- 01:01
want to find the product of three quarters and five sevenths. First we
- 01:05
multiply our numerators on top we've got 3 times 5 which gives us 15 next we
- 01:10
multiply those denominators down below we've got 4 times 7 which is 28 and
- 01:14
since fifteen and twenty eight share no common factors we're done. Easy as pie, or
- 01:20
fifteen twenty eighths of a pie good luck measuring out that slice. This [Man dances in front of pies]
- 01:24
method even works if we want to multiply fractions and whole numbers. Say if you want to
- 01:28
find the product of 5 sixths times 9 we just transform 9 into a fraction by placing
- 01:32
it over 1 then same ol same ol 5 times 9 is 45 and 6 times 1 is 6. 45 and 6 do
- 01:39
have a common factor of 3, so once we simplify that out of the numerator and [Dino and Coop looking at a blackboard]
- 01:43
the denominator we're left with 15 halves and we're done. Math that doesn't
- 01:49
require us to work on it until dawn? Sign us up! Well probably wear sweats or [Student sleeping on a couch]
- 01:54
something the wedding dress feels excessive..
Up Next
Check out the best bias video ever made, courtesy of the most awesome and amazing educational website in existence.
Related Videos
No, this isn't a terrible new mint-peach bubble gum flavor...though it does tend to leave a bad taste in people's mouths.
Those settlers in Jamestown really should have settled down with all that land-stealing. Tobacco's bad for you anyway.
Being born out of multiple wars doesn't quite seem to fit the peaceful, polite Canadians we know and love today...oh wait, they were called The Bea...
Not every cartoon is meant to entertain small children while their mother gets some "Mommy time." There are also political cartoons, which are mean...