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Dividing Fractions by NUMBEROCK Video Subscription Banner

Video Description:

Watch three friends vocalize together in this rap song about dividing fractions with the keep, change, flip method. Dividing a fraction by another fraction has never been so fun and easy to understand as they break down the meaning behind keep, change, flip, and show that even though it is a trick, it's not magic... it's mathemagic!

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Keep Change Flip Song Lyrics:

To divide by a fraction here’s a tip: KEEP, CHANGE, FLIP!
To divide by a fraction here’s a tip: KEEP, CHANGE, FLIP!

To divide one half by one sixth: KEEP, CHANGE, FLIP!
one times six is six, and two times one is two
it’s an improper fraction; so we’re not through.
Divide six by two and the quotient is three.
Keep, change, flip - it’s all that you need.


To divide two fifths by one fifth: KEEP, CHANGE, FLIP!
Two times five is ten, and five times one is five;
it’s an improper fraction, so you need to divide.
Ten divided by five equals two.
When we divide by fractions this is what we do!


“Keep - change - flip” may seem to work magically,
but it can be explained mathematically.
With the number ten, we can divide by two,
and that will leave five in each group...
Or we can find that “five” through a different path
by multiplying ten by two, “flipped” to one half.
It’s the trick that never fails called “keep - change - flip.”
It’s real mathemagic, so use this tip!

We understand with ease these problems we love,
because we know “division” means:
“...has how many groups of...”

Let’s explore that thought:
How many groups of “fourths” does one half got?
Two “fourths” fit into one half perfectly,
and we found the quotient mentally!


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