U.S. History 1877-Present 9: World War II
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|U.S. History||U.S. History 1877-Present|
Having fractions inside fractions looks… a little unstable.
Instead, we try to write them with the good old division sign.
Since division is the opposite of multiplication…
…what we do is multiply the first fraction by the reciprocal of the second fraction. [Fraction multiplied by reciprocal]
The reciprocal just means that we switch the numerator and denominator.
To take the reciprocal of the second fraction, we simply flip five-sixths and turn it around
into six-fifths and we get this… [Fraction numerator and denominator swap position]
Basically, the top becomes the bottom and the bottom becomes the top. [People fighting in a Martial Arts class]
If we have a whole number, we say that its denominator is 1.
Which means that the reciprocal is one-fourth.
After we've learned the reciprocal of the second fraction…
…we can multiply the two together.
3 times 6 is 18… and 4 times 5 is 20.
Giving us eighteen-twentieths.
Don't forget to simplify your answer as much as you can. [Girl writing]
The simpler the better. Dividing both sides by two gives us nine-tenths.
Once you get used to the turns and flips, dividing fractions shouldn't be too hard. [Rollercoaster in motion]
In fact, with all that flipping and turning, you should be ready to ride "The Dinner Dispenser”… [People holding arms in the air as rollercoaster goes by]