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Math 5: Multiplying Fractions 393 Views
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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..
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